MLA
African American Man Sitting down While Wearing a Suit and Holding a Hat, with Two African American Women in Dresses and Hats Standing behind Him. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/2902z34tpk-cor.
APA, 6th edition
African American man sitting down while wearing a suit and holding a hat, with two African American women in dresses and hats standing behind him (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2902z34tpk-cor.
Chicago
“African American Man Sitting down While Wearing a Suit and Holding a Hat, with Two African American Women in Dresses and Hats Standing behind Him.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2902z34tpk-cor.