MLA
Morley, Mary, and Son. African American Woman in a Dress Sitting, with an African American Boy in a Suit Standing next to Her. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/003cz8w9jf-cor.
APA, 6th edition
Morley, M., & S. African American woman in a dress sitting, with an African American boy in a suit standing next to her (Box 72) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/003cz8w9jf-cor.
Chicago
Morley, Mary, and Son. “African American Woman in a Dress Sitting, with an African American Boy in a Suit Standing next to Her.” 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/003cz8w9jf-cor.