Letter from Mrs. Mack Purnell to W. E. B. Du Bois

Chicago citation style
Purnell, Estelle. Letter from Mrs. Mack Purnell to W. E. B. Du Bois. 1923-02-21. Retrieved from the Digital Public Library of America, http://credo.library.umass.edu/view/full/mums312-b167-i407. (Accessed December 11, 2018.)
APA citation style
Purnell, Estelle, (1923-02-21) Letter from Mrs. Mack Purnell to W. E. B. Du Bois. Retrieved from the Digital Public Library of America, http://credo.library.umass.edu/view/full/mums312-b167-i407
MLA citation style
Purnell, Estelle. Retrieved from the Digital Public Library of America <http://credo.library.umass.edu/view/full/mums312-b167-i407>.
Note: These citations are programmatically generated and may be incomplete.