MLA
African American Man and Woman Sitting next to Each Other in a Single Chair, with the Man Wearing a Suit, and the Woman Wearing a Dress and Hat. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/3246q573qb-cor.
APA, 6th edition
African American man and woman sitting next to each other in a single chair, with the man wearing a suit, and the woman wearing a dress and hat (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3246q573qb-cor.
Chicago
“African American Man and Woman Sitting next to Each Other in a Single Chair, with the Man Wearing a Suit, and the Woman Wearing a Dress and Hat.” 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/3246q573qb-cor.