MLA
African American Man in a Suit, Sitting on a Bench, with an African American Woman Standing next to Him, with One Arm around His Shoulder, with a Basket of Flowers next to Her. 1919. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/351hhmgqqh-cor.
APA, 6th edition
African American man in a suit, sitting on a bench, with an African American woman standing next to him, with one arm around his shoulder, with a basket of flowers next to her (Box 72). (1919). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/351hhmgqqh-cor.
Chicago
“African American Man in a Suit, Sitting on a Bench, with an African American Woman Standing next to Him, with One Arm around His Shoulder, with a Basket of Flowers next to Her.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1919. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/351hhmgqqh-cor.