MLA
African American Man Sitting on a Chair While Wearing a Suit, with an African American Woman and Two African American Girls in Dresses Standing around Him. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/518rbnzs9n-cor.
APA, 6th edition
African American man sitting on a chair while wearing a suit, with an African American woman and two African American girls in dresses standing around him (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/518rbnzs9n-cor.
Chicago
“African American Man Sitting on a Chair While Wearing a Suit, with an African American Woman and Two African American Girls in Dresses Standing around 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/518rbnzs9n-cor.