MLA
Lions., Three. An African American Man and Woman Wearing Suits, Standing in Front of a Window While Holding an Open Book. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/9182jm641d-cor.
APA, 6th edition
Lions., T. An African American man and woman wearing suits, standing in front of a window while holding an open book (Box 74) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9182jm641d-cor.
Chicago
Lions., Three. “An African American Man and Woman Wearing Suits, Standing in Front of a Window While Holding an Open Book.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9182jm641d-cor.