MLA
Freeman, Daniel. Portrait of an African American Man in a Suit and Vest with a Mustache. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 17. https://digital.library.emory.edu/purl/235gb5mkz1-cor.
APA, 6th edition
Freeman, D. Portrait of an African American man in a suit and vest with a mustache (Box 17) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/235gb5mkz1-cor.
Chicago
Freeman, Daniel. “Portrait of an African American Man in a Suit and Vest with a Mustache.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 17. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/235gb5mkz1-cor.