MLA
Three African American Men Standing in Front of a Workshop, with Advertising Signs behind Them, with One Man Holding a Horse. 1912. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/4988gthtbj-cor.
APA, 6th edition
Three African American men standing in front of a workshop, with advertising signs behind them, with one man holding a horse (Box 70). (1912). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4988gthtbj-cor.
Chicago
“Three African American Men Standing in Front of a Workshop, with Advertising Signs behind Them, with One Man Holding a Horse.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1912. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4988gthtbj-cor.