MLA
Royster, J. Mammy : an African American Woman Sitting on a Set of Stairs in Front of a Building [Hand Colored]. 1907. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 73. https://digital.library.emory.edu/purl/313zs7h46n-cor.
APA, 6th edition
Royster, J. (1907). Mammy : an African American woman sitting on a set of stairs in front of a building [hand colored] (Box 73) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/313zs7h46n-cor.
Chicago
Royster, J. “Mammy : an African American Woman Sitting on a Set of Stairs in Front of a Building [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, 1907. Box 73. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/313zs7h46n-cor.