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Simms' blue book and national Negro business and professional directory
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "Dr. William Edward Burghardt DuBois." The New York Public Library Digital Collections. 1923. https://digitalcollections.nypl.org/items/510d47df-75af-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "Dr. William Edward Burghardt DuBois." New York Public Library Digital Collections. Accessed January 26, 2021. https://digitalcollections.nypl.org/items/510d47df-75af-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1923). Dr. William Edward Burghardt DuBois. Retrieved from https://digitalcollections.nypl.org/items/510d47df-75af-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47df-75af-a3d9-e040-e00a18064a99 | title=
(still image)
Dr. William Edward Burghardt DuBois., (1923)
|author=Digital Collections, The New York Public Library |accessdate=January 26, 2021 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>