MLA
Two African American Boys Dressed as Cowboys. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/774qjq2bz6-cor.
APA, 6th edition
Two African American boys dressed as cowboys (Box 72). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/774qjq2bz6-cor.
Chicago
“Two African American Boys Dressed as Cowboys.” 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/774qjq2bz6-cor.