MLA
Studio., Dunbar. Portrait of a African American Man in a Suit Seated with Right Leg Crossed over Left Leg. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 6. https://digital.library.emory.edu/purl/829b5mkm2j-cor.
APA, 6th edition
Studio., D. Portrait of a African American man in a suit seated with right leg crossed over left leg (Box 6) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/829b5mkm2j-cor.
Chicago
Studio., Dunbar. “Portrait of a African American Man in a Suit Seated with Right Leg Crossed over Left Leg.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 6. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/829b5mkm2j-cor.