^Whereat, Patty (June 2001). "Hanis Tlii'iis: Hanis Coos Language: A Word List"(PDF). Retrieved 2014-04-05. Fragments of the language can be scarcely found in Martha's husbands side of the family where she passed some pieces down to her grandchildren. The family name of her husbands side was the common last name of Bennett, also residents of Oregon.
Frachtenberg, Leo J. (1913). Coos texts. California University contributions to anthropology (Vol. 1). New York: Columbia University Press. (Reprinted 1969 New York: AMS Press).
Frachtenberg, Leo J. (1922). Coos: An illustrative sketch. In Handbook of American Indian languages (Vol. 2, pp. 297–299, 305). Bulletin, 40, pt. 2. Washington:Government Print Office (Smithsonian Institution, Bureau of American Ethnology).
Grant, Anthony. (1996). John Milhau's 1856 Hanis vocabularies: Coos dialectology and philology. In V. Golla (Ed.), Proceedings of the Hokan–Penutian workshop: University of Oregon, Eugene, July 1994 and University of New Mexico, Albuquerque, July 1995. Survey of California and other Indian languages (No. 9). Berkeley, CA: Survey of California and Other Languages.
Pierce, Joe E. 1971. Hanis (Coos) phonemics. Linguistics 75. 31-42.