MLA
African American Man Wearing a Suit, Sitting on a Stool While Holding a Hat on His Lap, in Front of an American Flag. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/846d2547js-cor.
APA, 6th edition
African American man wearing a suit, sitting on a stool while holding a hat on his lap, in front of an American flag (Box 71). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/846d2547js-cor.
Chicago
“African American Man Wearing a Suit, Sitting on a Stool While Holding a Hat on His Lap, in Front of an American Flag.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/846d2547js-cor.