Terborg-Penn 1987, p. 57. Terborg-Penn, Rosalyn (1987). "African Feminism: A Theoretical Approach to the History of Women in the African Diaspora". In Terborg-Penn, Rosalyn; Harley, Sharon; Rushing, Andrea Benton (eds.). Women in Africa and the African Diaspora. Washington, D.C.: Howard University Press. pp. 56–58. ISBN0-88258-171-6. OCLC16523550 – via Internet Archive.
Terborg-Penn 1997, p. 93. Terborg-Penn, Rosalyn (1997). "Higgins, Bertha G.". In Hine, Darlene Clark; Thompson, Kathleen (eds.). Facts on File Encyclopedia of Black Women in America. New York: Facts on File, Inc. pp. 92–94. ISBN0-8160-3425-7. OCLC35209436.
Terborg-Penn 1987, p. 57. Terborg-Penn, Rosalyn (1987). "African Feminism: A Theoretical Approach to the History of Women in the African Diaspora". In Terborg-Penn, Rosalyn; Harley, Sharon; Rushing, Andrea Benton (eds.). Women in Africa and the African Diaspora. Washington, D.C.: Howard University Press. pp. 56–58. ISBN0-88258-171-6. OCLC16523550 – via Internet Archive.
Terborg-Penn 1997, p. 93-94. Terborg-Penn, Rosalyn (1997). "Higgins, Bertha G.". In Hine, Darlene Clark; Thompson, Kathleen (eds.). Facts on File Encyclopedia of Black Women in America. New York: Facts on File, Inc. pp. 92–94. ISBN0-8160-3425-7. OCLC35209436.
Terborg-Penn 1997, p. 94. Terborg-Penn, Rosalyn (1997). "Higgins, Bertha G.". In Hine, Darlene Clark; Thompson, Kathleen (eds.). Facts on File Encyclopedia of Black Women in America. New York: Facts on File, Inc. pp. 92–94. ISBN0-8160-3425-7. OCLC35209436.