In Asia, women were vital in philosophy in ancient times. In the oldest text of the Upanishads, c. 700 BCE, the female philosophers Gargi and Maitreyi are part of the philosophical dialogues with the sage Yajnavalkya. Ubhaya Bharati (c. 800 AD) and Akka Mahadevi (1130–1160) are other known female thinkers in the Indian philosophical tradition. In China, Confucius hailed the female Jing Jiang of Lu (5th c. BCE) as being wise and an example for his students, while Ban Zhao (45–116) wrote several vital historical and philosophical texts. In Korea, Im Yunjidang (1721–93) were among the most notable women philosophers during the enlightened mid-Chosŏn era. Among notable female Muslim philosophers are Rabia of Basra (714–801), A’ishah al-Ba’uniyyah of Damascus (d. 1517), and Nana Asma'u (1793–1864) from the Sokoto Caliphate of today's Nigeria. In early colonial Latin-America, the philosopher Sor Juana Inés de la Cruz (1651–95) was known as "The Phoenix of America".
In the early 1990s, the Canadian Philosophical Association claimed that there is gender imbalance and gender bias in the academic field of philosophy. In June 2013, a US sociology professor stated that "out of all recent citations in four prestigious philosophy journals, female authors comprise just 3.6 percent of the total." The editors of the Stanford Encyclopedia of Philosophy have raised concerns about the underrepresentation of women philosophers, and they require editors and writers to ensure they represent the contributions of women philosophers. According to Eugene Sun Park, "[p]hilosophy is predominantly white and predominantly male. This homogeneity exists in almost all aspects and at all levels of the discipline." Susan Price argues that the philosophical "...canon remains dominated by white males—the discipline that...still hews to the myth that genius is tied to gender." According to Saul, "[p]hilosophy, the oldest of the humanities, is also the malest (and the whitest). While other areas of the humanities are at or near gender parity, philosophy is actually more overwhelmingly male than even mathematics."
American philosopher Martha Nussbaum, who completed a PhD in philosophy at Harvard University in 1975, alleges that she encountered a tremendous amount of discrimination at Harvard, including sexual harassment and problems getting childcare.
In the early 1990s, the Canadian Philosophical Association claimed that "...there is compelling evidence" of "...philosophy’s gender imbalance" and "bias and partiality in many of its theoretical products." In 1992, the association recommended that "fifty percent of [philosophy]...positions should be filled by women.” In a 2008 article “Changing the Ideology and Culture of Philosophy: Not by Reason (Alone),” MIT philosophy professor Sally Haslanger stated that the top twenty graduate programs in philosophy in the US have from 4 percent to 36 percent women faculty. In June 2013, Duke University professor of sociology Kieran Healy stated that "out of all recent citations in four prestigious philosophy journals, female authors comprise just 3.6 percent of the total." The editors of the Stanford Encyclopedia of Philosophy have raised concerns about the underrepresentation of women philosophers; as such, the encyclopedia “encourage[s] [their] authors, subject editors, and referees to help ensure that SEP entries do not overlook the work of women or indeed of members of underrepresented groups more generally.”
In 2014, philosophy professors Neven Sesardic and Rafael De Clercq published an article entitled "Women in Philosophy: Problems with the Discrimination Hypothesis." The article states that a "...number of philosophers attribute the underrepresentation of women in philosophy largely to bias against women or some kind of wrongful discrimination". Evidence cited includes "gender disparities that increase along the path from undergraduate student to full-time faculty member"; "anecdotal accounts of discrimination in philosophy"; "research on gender bias in the evaluation of manuscripts, grants, and curricula vitae in other academic disciplines"; "psychological research on implicit bias"; "psychological research on stereotype threat" and the "...relatively small number of articles written from a feminist perspective in leading philosophy journals". Sesardic and De Clercq argue that "proponents of the discrimination hypothesis, who include distinguished philosophers ...have tended to present evidence selectively."
American philosopher Sally Haslanger stated in 2008 that "...it is very hard to find a place in philosophy that isn’t actively hostile towards women and minorities, or at least assumes that a successful philosopher should look and act like a (traditional, white) man.” Haslanger states that she experienced “occasions when a woman’s status in graduate school was questioned because she was married, or had a child (or had taken time off to have a child so was returning to philosophy as a ‘mature’ student), or was in a long-distance relationship". American philosopher Martha Nussbaum, who completed a PhD in philosophy at Harvard University in 1975, alleges that she encountered a tremendous amount of discrimination during her studies at Harvard, including sexual harassment and problems getting childcare for her daughter.
In July 2015, British philosopher Mary Warnock addressed the issue of the representation of women in British university philosophy departments, where 25% of faculty are women. Warnock stated she is "... against intervention, by quotas or otherwise, to increase women’s chances of employment" in philosophy. She also argues that "... there is nothing intrinsically harmful about this imbalance" and she states that she does not "...believe it shows a conscious bias against women."  Philosopher Julian Baggini states that he believes that there is "...little or no conscious discrimination against women in philosophy". At the same time, Baggini states that there may be a "...great deal of unconscious bias" against women in philosophy, because philosophy generally does not address issues of gender or ethnicity.
Allegations of sexual harassment
In 2014, Inside Higher Education described the philosophy "...discipline’s own long history of misogyny and sexual harassment." On March 28, 2011, the blog New APPS published a post examining the allegations of persistent sexual harassment faced by women professors in philosophy, due largely to "serial harassers" continuing to work in the field despite widespread knowledge of their actions. The post proposed that, since institutional procedures seemed to have been ineffective at removing or punishing harassers, philosophers should socially shun known offenders. The story was subsequently featured at Inside Higher Ed and several blogs, including Gawker and Jezebel. In 2013, a series of posts on the blog "What's it like to be a woman in philosophy?" instigated a spate of mainstream media articles on the continued dominance of men in philosophy. Eric Schliesser, a professor of philosophy at Ghent University, said he believes that the "...systematic pattern of exclusion of women in philosophy is, in part, due to the fact that my profession has allowed a culture of harassment, sexual predating, and bullying to be reproduced from one generation to the next."
According to Heidi Lockwood, an associate professor of philosophy at Southern Connecticut State University, there is a "...power “asymmetry” between professors and students – even graduate students"; as well, she noted that "...even when colleges and universities have blanket prohibitions against professor-student sexual relationships, as does Yale,...institution-specific policies leave students vulnerable [to sexual advances from faculty] at conferences."
According to an August 2013 article in Salon, a tenured male University of Miami philosopher resigned after allegedly "...sending emails to a [female] student in which he suggested that they have sex three times."Jennifer Saul, a professor of philosophy at the University of Sheffield, set up a blog for women philosophers in 2010. She received numerous allegations of sexual harassment by male philosophy faculty, including a "job candidate who said she was sexually assaulted at the annual APA meeting where job interviews take place", an "undergraduate whose professor joked publicly about dripping hot wax on her nipples" and a "... lesbian who found herself suddenly invited, after she came out, to join in the sexualizing of her female colleagues." Saul states that philosophy departments failed to deal with the allegations. In 2013, the American Philosophical Association formed a committee to study the allegations of sexual harassment of women students and professors by male philosophy faculty. Saul states that one of the allegations was regarding a "...distinguished visiting speaker whose first words are: “Show me a grad student I can fuck”."  Saul states that women are "...leaving philosophy after being harassed, assaulted, or retaliated against."  In 2014, Inside Higher Education reported allegations that a Yale University philosophy professor had sexually harassed a woman; the "alleged victim says she reported the professor to Yale, with no real result".
In an interview with Inside Higher Ed, the alleged victim stated that she "...suffers from post-traumatic stress disorder that impedes everyday life, not only from the alleged attack but also from the “browbeating” she endured as she attempted to report the professor, again and again, to Yale officials."
In 1993, the American Philosophical Association's sexual harassment committee set out guidelines for addressing this issue in philosophy departments. The APA guidelines, which were revised in 2013, stated that:
"Sexual advances, requests for sexual favors, or sexually directed remarks constitute sexual harassment when submission to such conduct is made a condition of academic or employment decisions, or when such conduct persists despite its rejection."
"Sexual harassment is a serious violation of professional ethics, and should be regarded and treated as such by members of the profession. Sexual harassment is a form of prohibited discrimination when an institution or individual employee is aware of a sexually hostile environment and condones, tolerates or allows that environment to exist. Colleges and universities should supply clear, fair institutional procedures under which charges of sexual harassment on campus can be brought, assessed, and acted on."
"Complaints of sexual harassment at APA-sponsored activities should be brought to the chair of the committee for the defense of professional rights of philosophers or, if they arise in the context of placement activities, to the APA ombudsperson. Complaints of sexual harassment by or against APA staff members should be brought to the chair of the board."
Nana Asma'u (1793-1864), from the Sokoto Caliphate in today's Nigeria, is one of many notable black women philosophers. She was a founder of the educational network Yan Taru (‘The Associates’), which is still active today. She wrote in the Fulfulde, Hausa and Arabic languages, and her first text had the title: ‘Warning for the Negligent and Reminder for the Intelligent Regarding the Ways of the Pious’. She argued for humility between people, and for "good relations with one’s relatives, servants, and comrades. This is shown by being cheerful with them; doing good things for them; serving them; never acting as if superior to them; consulting them in many matters; helping them financially and physically [...]"
There are few black women philosophers, which includes women of African and Caribbean ancestry, African-Americans and other individuals from the African diaspora. According to philosopher Sally Haslanger, the "numbers of philosophers of color, especially women of color, is even more appalling"; in a 2003 study, there "...was insufficient data for any racial group of women other than white women to report."  In the United States, the "...representation of scholars of color is plausibly worse than in any other field in the academy, including not only physics, but also engineering." According to professor L.K. McPherson, there is a "gross underrepresentation of blacks in philosophy." McPherson states that there is a "...willful, not necessarily a conscious, preference among many members of the philosophy profession largely to maintain the status quo in terms of: the social group profiles of members; the dynamics of prestige and influence; and the areas and questions deemed properly or deeply 'philosophical.' None of this is good for black folk."
Few Asian women are recognized in contemporary Western philosophy. In a New York Times interview with George Yancy, Korean-American philosopher Emily S. Lee, assistant professor of philosophy at California State University, Fullerton, states, "I wonder if some of my experiences occur from being Asian-American, in the ways people stereotypically assume that I must specialize in certain areas of philosophy or behave in specific ways, such as being quiet and subdued." She postulates that the social forces that stereotype and encourage Asian-Americans to enter more lucrative and secure fields (such as engineering or medicine) combined with influences within the field of philosophy discouraging Asian-American youths from continuing their study in the field has led to the extremely small population of Asian-American female philosophers. University of Washington philosophy professor Carole Lee's report in the American Philosophical Association's newsletter on Asian and Asian-American Philosophers and Philosophies suggests that Asian women face conflicting stereotypes, making it difficult for them to fit into the field of philosophy: "Women are stereotyped as submissive rather than aggressive and as being bad at math: they lack both characteristics associated with philosophy." On the other had, "Asian Americans are stereotyped as being mathematical; however, they are characterized in passive rather than aggressive terms." Philosopher David Kim offers the explanation that a lack of Asian American mentors in philosophy and "derogation of philosophical thought that resonates with their identity" may also contribute to the wide disparity.
Reports from the US
U.S. Department of Education reports indicate that philosophy is one of the least proportionate fields in the humanities with respect to gender. Although reports indicate that philosophy as a professional field is disproportionately male, no clear, unequivocal data exists on the number of women currently in philosophy, or indeed, on the number of men in philosophy, and it is debatable how to define what it means to be ‘in philosophy.’ This can variously be defined as the current number of Ph.D. holders in philosophy, the current number of women teaching philosophy in two- and four- year institutions of higher learning either/both full-time and/or part-time (no one data set exists which measures these), or the current number of living women with publications in philosophy. The lack of clear data makes it difficult to establish gender proportions, but the consensus among those who have tried to arrive at an estimate is that women make up between 17% and 30% of academically employed philosophers.
The National Center for Education Statistics' 2000 report, "Salary, Promotion, and Tenure Status of Minority and Women Faculty in U.S. Colleges and Universities," estimates in Table 23 that the total number of "History and Philosophy" U.S. citizens and full-time faculty who primarily taught in 1992 was 19,000, of which 79% were men (i.e. 15,010 men in history and philosophy), 21% were women (3,990). They add, "In fact, men were at least twice as likely as women to teach history and philosophy."
In their 1997 report, "Characteristics and Attitudes of Instructional Faculty and Staff in the Humanities," NCES notes, that about "one-half of full-time instructional faculty and staff in 4-year institutions in English and literature (47 percent) and foreign languages (50 percent) were female in the fall of 1992, compared with less than one-half of instructional faculty and staff in history (24 percent) and philosophy and religion (13 percent) (table 4)." In this report they measure Philosophy and Religion in the same data set, and estimate the total number of full-time instructional Philosophy and Religion faculty and staff in 4-yr institutions to be 7,646. Of these, 87.3% are male (6675 men),
12.7 are female (971 women). The 1997 report measures History Full-time instructional faculty and staff in 4-yr institutions to be 11,383; male:76.3 (8,686 men);
female: 23.7 (2,697 women). The numbers of women in philosophy from the two studies are not easily comparable, but one rough method may be to subtract the number of women in history in the 1997 report from the number of women estimated to be in 'history and philosophy' in the 2000 report. Doing so suggests that as a rough estimate, 1,293 women are employed as instructors of philosophy.
The 1997 report indicates that a large portion of all humanities instructors are part-time. Part-time employees are disproportionately female but not majority female. Therefore, considerations of full-time employees only necessarily leave out data on many women working part-time to remain active in their field. In 2004, the percentage of Ph.D.s in philosophy, within the U.S., going to women reached a record high percentage: 33.3%, or 121 of the 363 doctorates awarded.
Organizations and campaigns
Minorities and Philosophy
Minorities and Philosophy (MAP) is an international movement of graduate and undergraduate students and faculty members in philosophy working on issues related to “the underrepresentation of women an minorities in philosophy.” MAP consists of chapters at universities around the world, and the format can vary from school to school. However, all chapters focus broadly on issues minorities face in the profession, philosophical issues regarding minorities, and work done by minority philosophers, as well as issues that are specific to that school's philosophy department. MAP's short-term goals include providing a space for students to discuss and work on these issues, and long-term goals include contributing to the culture of academic philosophy and increasing participation and recognition of minorities in philosophy. In recent years, MAP has fostered collaborative work between chapters, establishing "connections between chapters that benefit both members and departments long-term," increased work on inclusive pedagogy, and organized efforts to bring philosophy into communities outside of university campuses, such as prisons and elementary schools.
APA committee on the status of women in philosophy
The Committee on the Status of Women is a committee of the American Philosophical Association devoted to the assessment and reporting on the status of women in philosophy. It is currently chaired by Hilde Lindemann. In April 2007, the Committee on the Status of Women co-sponsored a session on the central question "Why Are Women Only 21% of Philosophy". At this session, Sharon Crasnow suggested that the low numbers of women in philosophy may be due to:
Differential treatment: male and female university students may be treated differently in the classroom.
Vicious circle: female students do not feel inclined to study philosophy because of a lack of contact with female philosophy professors.
Misleading statistics: university administrators focus on gender representation in the humanities overall, which obscures the disparity in philosophy.
Society for Women in Philosophy
The Society for Women in Philosophy is a group created in 1972 that seeks to support and promote women in philosophy. It has a number of branches around the world, including in New York, the American Pacific, the United Kingdom and Canada. Each year, the society names one philosopher the distinguished woman philosopher of the year.
The blog Feminist Philosophers hosts the Gendered Conference Campaign, which works toward increasing the representation of women at philosophy conferences and in edited volumes. The blog states that "all-male events and volumes help to perpetuate the stereotyping of philosophy as male. This in turn to contributes to implicit bias against women in philosophy...."
While there were women philosophers since the earliest times, and some were accepted as philosophers during their lives, almost no woman philosophers have entered the philosophical Western canon. Historians of philosophy are faced with two main problems. The first being the exclusion of women philosophers from history and philosophy texts, which leads to a lack of knowledge about women philosophers among philosophy students. The second problem deals with what the canonical philosophers had to say about philosophy and women's place in it. In the past twenty-five years there has been an exponential increase in feminist writing about the history of philosophy and what has been considered the philosophical canon. According to Eugene Sun Park, "[p]hilosophy is predominantly white and predominantly male. This homogeneity exists in almost all aspects and at all levels of the discipline."  According to Jennifer Saul, a professor of philosophy at the University of Sheffield, "[p]hilosophy, the oldest of the humanities, is also the malest (and the whitest). While other areas of the humanities are at or near gender parity, philosophy is actually more overwhelmingly male than even mathematics."
In the May 13, 2015 issue of The Atlantic, Susan Price notes that even though Kant's first work in 1747 cites Émilie Du Châtelet, a philosopher who was a "...scholar of Newton, religion, science, and mathematics", "her work won’t be found in the 1,000-plus pages of the new edition of The Norton Introduction to Philosophy."  The Norton Introduction does not name a female philosopher until the book begins to cover the mid-20th century. Scholars argue that women philosophers are also absent from the "...other leading anthologies used in university classrooms."  Price states that university philosophy anthologies do not usually mention 17th century women philosophers such as Margaret Cavendish, Anne Conway, and Lady Damaris Masham. Price argues that the philosophical "...canon remains dominated by white males—the discipline that some say still hews to the myth that genius is tied to gender." Amy Ferrer, executive director of the American Philosophical Association, states that “...women have been systematically left out of the canon, and that women coming in have not been able to see how much influence women have had in the field."The Encyclopedia of Philosophy, which as published in 1967, had "...articles on over 900 philosophers, [but it] did not include an entry for Wollstonecraft, Arendt or de Beauvoir. "[T]hese women philosophers were scarcely even marginal" to the canon set out at the time.
Explaining the very small number of women philosophers, American academic and social critic Camille Paglia (born 1947) argues that "...women in general are less comfortable than men in inhabiting a highly austere, cold, analytical space, such as the one which philosophy involves. Women as a whole ...are more drawn to practical, personal matters. It is not that they inherently lack a talent or aptitude for philosophy or higher mathematics, but rather that they are more unwilling than men to devote their lives to a frigid space from which the natural and the human have been eliminated." Paglia claims that "[t]oday's lack of major female philosophers is not due to lack of talent but to the collapse of philosophy", because, in her view, philosophy "... as traditionally practised may be a dead genre" that "belongs to a vanished age of much slower and rhetorically formal inquiry."
In the Aeon essay "First women of philosophy" in December 2018, the global historian of ideas Dag Herbjørnsrud writes about the many women philosophers of the Global South, and concludes: "Philosophy was once a woman’s world, ranging across Asia, Africa and Latin America. It’s time to reclaim that lost realm." Herbjørnsrud argues that women and philosophers of color were excluded from the philosophical canon by Kant, Hegel and their supporters.
Some of the earliest philosophers were women, such as Hipparchia of Maroneia (active ca. 325 BC), Arete of Cyrene (active 5th–4th century BC) and Aspasia of Miletus (470–400 BC). Aspasia appears in the philosophical writings of Plato, Xenophon, Aeschines Socraticus and Antisthenes. Some scholars argue that Plato was impressed by her intelligence and wit and based his character Diotima in the Symposium on her.Socrates attributes to the (possibly fictional) Diotima of Mantinea his lessons in the art of Eros (or philosophical searching). Plato's final views on women are highly contested, but the Republic suggests that women are equally capable of education, intellectual vision, and rule of the city.
Elisabeth of Bohemia (1618–1680) influenced many key figures and philosophers, most notably René Descartes, who she corresponded with. She questioned Descartes' idea of dualism, or the mind being separate from the body, and his theories regarding communication between the mind and body.
Margaret Cavendish (1623–1673) was a philosopher and writer who addressed gender, power, manners, scientific methods, and philosophy.
Laura Bassi (1711–1778) was an Italian philosopher and physicist who was the first woman in the world to earn a university chair in a scientific field of studies. She received a doctoral degree from the University of Bologna in May 1732, the third academic qualification ever bestowed on a woman by a university, and the first woman to earn a professorship in physics at a university in Europe. She was the first woman to be offered an official teaching position at a university in Europe.
Harriet Martineau (1802–1876) was an English social theorist and political writer, often cited as the first female sociologist. She wrote books and essays from a sociological, holistic, religious, domestic, and feminine perspective. In Society in America, she criticised the state of women's education, stating that the "intellect of women is confined by an unjustifiable restriction" of access to education; she urged women to become well-educated and free.
Harriet Taylor Mill (1807–1858) was a philosopher and women's rights advocate. In John Stuart Mill's autobiography, he claimed she was the joint author of most of the books and articles published under his name. He stated that "when two persons have their thoughts and speculations completely in common it is of little consequence, in respect of the question of originality, which of them holds the pen." Together, they wrote "Early Essays on Marriage and Divorce", published in 1832. The debate about the nature and extent of her collaboration is ongoing.
Victoria, Lady Welby (1837–1912) was a self-educated English philosopher of language. She was published articles in the leading English language academic journals of the day, Mind and The Monist. She published her first philosophical book, What Is Meaning? Studies in the Development of Significance in 1903, following it with Significs and Language: The Articulate Form of Our Expressive and Interpretive Resources in 1911. Welby's concern with the problem of meaning included (perhaps especially) the everyday use of language, and she coined the word significs for her approach. Welby's theories on signification anticipated contemporary semantics, semiotics, and semiology.
Helene von Druskowitz (1856–1918) was an Austrian philosopher, writer and music critic. She was the second woman to obtain a Doctorate in Philosophy, which she obtained in Zürich. She usually published under a male alias because of the predominant sexism of the era.
Charlotte Perkins Gilman (1860–1935) was an American feminist, sociologist, novelist, writer and social reformer. Her short story "The Yellow Wallpaper" became a bestseller. The story is about a woman who suffers from mental illness after three months of being closeted in a room by her husband. She argued that the domestic environment oppressed women through the patriarchal beliefs upheld by society. Gilman argued that women's contributions to civilization, throughout history, have been halted because of an androcentric culture. She argued that women were the underdeveloped half of humanity. She believed economic independence would bring freedom and equality for women.
Early 20th century
Mary Whiton Calkins (1863–1930) was an American philosopher and psychologist. She was also the first woman to become president of the American Psychological Association and the American Philosophical Association. Calkins studied psychology under William James and studied at Harvard University, which allowed her to attend courses but refused to register her as a student, because she was a woman. She published her doctoral dissertation in 1896, and Harvard's Department of Philosophy and Psychology recommended that she be granted her PhD, but Harvard's President and board refused, as she was a woman. The President believed women should not study with men. James was astonished at the university's decision, as he described her performance as "the most brilliant examination for the Ph.D. that we have had at Harvard."  She published four books and over one hundred papers in her career in psychology and philosophy. She was also an avid supporter of women's rights and an advocate of women's right to vote.
Mary Midgley (born 1919) is an English moral philosopher. A senior lecturer in philosophy at Newcastle University, she is known for her work on science, ethics and animal rights. Midgley strongly opposes reductionism and scientism, and any attempts to make science a substitute for the humanities—a role for which it is, she argues, wholly inadequate. She has written extensively about what philosophers can learn from nature, particularly from animals. The Guardian has described her as a fiercely combative philosopher and the UK's "foremost scourge of 'scientific pretension.'"
^ ab"Salary, Promotion, and Tenure Status of Minority and Women Faculty in U.S. Colleges and Universities."National Center for Education Statistics, Statistical Analysis Report, March 2000; U.S. Department of Education, Office of Education Research and Improvement, Report # NCES 2000–173;1993 National Study of Postsecondary Faculty (NSOPF:93). See also "Characteristics and Attitudes of Instructional Faculty and Staff in the Humanities." National Center For Education Statistics, E.D. Tabs, July 1997. U.S. Department of Education, Office of Education Research and Improvement, Report # NCES 97-973;1993 National Study of Postsecondary Faculty (NSOPF-93).
^ abU.S. Department of Education statistics in above-cited reports seem to put the number closer to 17%, but these numbers are based on data from the mid-1990s. Margaret Urban Walker's more recent article (2005) discusses the data problem and describes more recent estimates as an "(optimistically projected) 25–30 percent."
^NCES (1997): "Forty-two percent of all instructional faculty and staff were employed part time by their institution in the fall of 1992. Forty-five percent of [all U.S.] humanities faculty were employed part time."
^NCES (1997): "Part-time faculty members were more likely to be female (45 percent) than full-time faculty (33 percent), although the majority of both part- and full-time faculty were male (55 percent and 67 percent, respectively)."
^Witt, Charlotte and Shapiro, Lisa, "Feminist History of Philosophy", The Stanford Encyclopedia of Philosophy (Spring 2015 Edition), Edward N. Zalta (ed.), URL = <[plato.stanford.edu]>.
^Witt, Charlotte; Shapiro, Lisa (11 July 2018). Zalta, Edward N. (ed.). The Stanford Encyclopedia of Philosophy. Metaphysics Research Lab, Stanford University – via Stanford Encyclopedia of Philosophy.
^Krebs, Groundbreaking Scientific Experiments, Inventions, and Discoveries; The Cambridge Dictionary of Philosophy, 2nd edition, Cambridge University Press, 1999: "Greek Neoplatonist philosopher who lived and taught in Alexandria."
^Mueller, I.; L.S. Grinstein & P.J. Campbell (1987). Women of Mathematics: A Biobibliographic Sourcebook. New York: Greenwood Press.
^Christopher Green (Producer). (n.d.). Katharine Milar on the first woman president of the APA, Mary Whiton Calkins. [Audio podcast]. This week in the history of psychology. Retrieved from [www.yorku.ca]
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