MLA
Three African American Men on Railway Carts Carrying Rocks. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/986b2rbp3z-cor.
APA, 6th edition
Three African American men on railway carts carrying rocks (Box 71). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/986b2rbp3z-cor.
Chicago
“Three African American Men on Railway Carts Carrying Rocks.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/986b2rbp3z-cor.