MLA
Mr. and Mrs. Diggs Sitting on a Chair Together, Mr. Diggs Wearing a Suit, and Mrs. Diggs Wearing a Dress, a Hat, Gloves and Eyeglasses. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/317crjdfqb-cor.
APA, 6th edition
Mr. and Mrs. Diggs sitting on a chair together, Mr. Diggs wearing a suit, and Mrs. Diggs wearing a dress, a hat, gloves and eyeglasses (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/317crjdfqb-cor.
Chicago
“Mr. and Mrs. Diggs Sitting on a Chair Together, Mr. Diggs Wearing a Suit, and Mrs. Diggs Wearing a Dress, a Hat, Gloves and Eyeglasses.” 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/317crjdfqb-cor.