MLA
Portrait of an African American Man in a Suit Seated in a Chair and an African American Woman in a Dress with a Flowered Hat Standing next to Him in Front of an U.S. Flag. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 8. https://digital.library.emory.edu/purl/955m905qn5-cor.
APA, 6th edition
Portrait of an African American man in a suit seated in a chair and an African American woman in a dress with a flowered hat standing next to him in front of an U.S. flag (Box 8). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/955m905qn5-cor.
Chicago
“Portrait of an African American Man in a Suit Seated in a Chair and an African American Woman in a Dress with a Flowered Hat Standing next to Him in Front of an U.S. Flag.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 8. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/955m905qn5-cor.