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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. Willis examining the heart and lungs of a patient by X-Ray." The New York Public Library Digital Collections. 1923. https://qa-digitalcollections.nypl.org/items/510d47df-7596-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "Dr. Willis examining the heart and lungs of a patient by X-Ray." New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47df-7596-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1923). Dr. Willis examining the heart and lungs of a patient by X-Ray. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47df-7596-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47df-7596-a3d9-e040-e00a18064a99 | title=
(still image)
Dr. Willis examining the heart and lungs of a patient by X-Ray., (1923)
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