APA Style is a writing style and format for academic documents such as scholarly journal articles and books. It is commonly used for citing sources within the field of behavioral and social sciences. It is described in the style guide of the American Psychological Association (APA), which is titled the Publication Manual of the American Psychological Association. The guidelines were developed to aid reading comprehension in the social and behavioral sciences, for clarity of communication, and for "word choice that best reduces bias in language". APA Style is widely used, either entirely or with modifications, by hundreds of other scientific journals (including medical and other public health journals), in many textbooks, and in academia (for papers written in classes).
The APA became involved in journal publishing in 1923. In 1929, an APA committee had a seven-page writer's guide published in the Psychological Bulletin. In 1944, a 32-page guide appeared as an article in the same journal. The first edition of the APA Publication Manual was published in 1952 as a 61-page supplement to the Psychological Bulletin, marking the beginning of a recognized "APA Style." The initial edition went through two revisions: one in 1957, and one in 1967. Subsequent editions were released in 1974, 1983, 1994, 2001, 2009, and 2019.
Primarily known for the simplicity of its reference citation style, the Manual also established standards for language use that had far-reaching effects. Particularly influential were the "Guidelines for Nonsexist Language in APA Journals," first published as a modification to the 1974 edition, which provided practical alternatives to "sexist" language then in common usage. The guidelines for reducing bias in language have been updated over the years and presently provide practical guidance for writing about age, disability, gender, participation in research, race and ethnicity, sexual orientation, socioeconomic status, and intersectionality (APA, 2020, Chapter 5). 
The seventh edition of the Publication Manual of the American Psychological Association is the current one, published in October 2019. The goal of the book is to help people become better writers and communicators by promoting clarity, precision, and inclusivity.
The manual has new resources for students, including a student title page, student paper formats, and student-related reference formats such as classroom course pack material and classroom website sources. The book also includes new journal article reporting standards for qualitative and mixed methods research in addition to updated standards for quantitative research. The bias-free language guidelines have also been updated to reflect current best practices for talking about people's personal characteristics such as age, disability, gender, participation in research, sexual orientation, socioeconomic status, or race/ethnicity and also how to address intersectionality.
The manual addresses accessibility for people with disabilities for the first time. APA worked with accessibility experts to ensure APA Style is accessible. For example, the in-text citation format is shortened so that the citations are easier to read for people who, for example, use screen readers or have cognitive disabilities.
The manual has more than 100 new reference examples, including new formats for audiovisual media, social media, and webpages. There are more than 40 new sample tables and figures, including basic student-friendly examples such as bar graphs. There are also two new sample papers, one for professionals and one for students.
The sixth edition of the Publication Manual of the American Psychological Association was in effect from 2009 to 2019, after four years of development. The Publication Manual Revision Task Force of the American Psychological Association established parameters for the revision based on published critique; user comments; commissioned reviews; and input from psychologists, nurses, librarians, business leaders, publishing professionals, and APA governance groups. To accomplish these revisions, the Task Force appointed working groups of four to nine members in seven areas: bias-free language, ethics, graphics, Journal Article Reporting Standards, references, statistics, and writing style (APA, 2009, pp. XVII–XVIII).
The APA explained the issuing of a new edition only eight years after the fifth edition by pointing to the increased use of online source or online access to academic journals (6th edition, p. XV). The sixth edition is accompanied by a style website, apastyle.org as well as the APA Style Blog, which answers many common questions from users.
Sample papers in the first printing of the sixth edition contained errors. APA staff posted all of the corrections online for free in a single document on October 1, 2009, and shortly thereafter alerted users to the existence of the corrections in an APA blog entry. These errors attracted significant attention from the scholarly community and nearly two weeks later, on October 13, 2009, the article "Correcting a Style Guide" was published in the online newspaper Inside Higher Ed that included interviews with several individuals, one of whom described the errors as "egregious". All copies of the printing with errors were soon after recalled in 2009 (including those from major retailers such as Amazon.com) and a new printing correcting all the errors, with a copyright date of 2010, was issued.
APA Style uses an author–date reference citation system in the text with an accompanying reference list. That means that to cite any reference in a paper, the writer should cite the author and year of the work, either by putting both in parentheses separated by a comma (parenthetical citation) or by putting the author in the narrative of the sentence and the year in parentheses (narrative citation).
Example narrative citation: Schmidt and Oh (2016) described a fear among the public that the findings of science are not actually real.
Example parenthetical citation: In our postfactual era, many members of the public fear that the findings of science are not real (Schmidt & Oh, 2016).
In the APA reference list, the writer should provide the author, year, title, and source of the cited work in an alphabetical list of references. If a reference is not cited in the text, it should not be included in the reference list. The reference format varies depending on the document type (e.g., journal article, edited book chapter, blog post, webpage), but broadly speaking always follows the same pattern of author, date, title, source.
|Journal article with a DOI||Author, A., & Author, B. (year). Title of article. Journal Title, Volume(Issue), page range. DOI||Schmidt, F. L., & Oh, I.-S. (2016). The crisis of confidence in research findings in psychology: Is lack of replication the real problem? Or is it something else? Archives of Scientific Psychology, 4(1), 32–37. [doi.org]|
|Whole book||Author, A., & Author, B. (year). Title of book. Publisher.||Brown, B. (2010). The gifts of imperfection: Let go of who you think you're supposed to be and embrace who you are. Hazelden.|
|Edited book chapter with a DOI||Author, A., & Author, B. (year). Title of chapter. In E. Editor & A. Editor (Eds.), Title of book (pp. xx-xx). Publisher. DOI||Singh, A. A., Hwahng, S. J., Chang, S. C., & White, B. (2017). Affirmative counseling with trans/gender-variant people of color. In A. Singh & L. M. Dickey (Eds.), Affirmative counseling and psychological practice with transgender and gender nonconforming clients (pp. 41–68). American Psychological Association. [doi.org]|
|Webpage on a website||Author, A., & Author, B. (year). Title of page. Site Name. URL
Group Author. (year). Title of page. URL
|American Psychological Association. (n.d.). APA divisions. [www.apa.org]|
APA format is complex and takes time to learn.
The APA style is a very complex style.
|Wikiversity has learning resources about APA style|