MLA
Alcorn. Portrait of an African American Man Wearing a Suit. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 57. https://digital.library.emory.edu/purl/627zkh18g7-cor.
APA, 6th edition
A. Portrait of an African American man wearing a suit (Box 57) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/627zkh18g7-cor.
Chicago
Alcorn. “Portrait of an African American Man Wearing a Suit.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 57. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/627zkh18g7-cor.