MLA
Wittemann, A. African American Boy Riding an Alligator in Jacksonville, Florida. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/791sf7m0fh-cor.
APA, 6th edition
Wittemann, A. African American boy riding an alligator in Jacksonville, Florida (Box 72) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/791sf7m0fh-cor.
Chicago
Wittemann, A. “African American Boy Riding an Alligator in Jacksonville, Florida.” 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/791sf7m0fh-cor.