MLA
Two Men, One Standing, Smoking Pipes, in a Cart with a Donkey. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 75. https://digital.library.emory.edu/purl/883xsj3txx-cor.
APA, 6th edition
Two men, one standing, smoking pipes, in a cart with a donkey (Box 75). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/883xsj3txx-cor.
Chicago
“Two Men, One Standing, Smoking Pipes, in a Cart with a Donkey.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 75. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/883xsj3txx-cor.