MLA
Transportation of Cotton by Road : an African American Man with a Whip Riding on Top of a Flat Wagon, Loaded with Cotton, Pulled by Oxen, with an African American Man Standing by the Wagon. 1918. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/129p2ngf4w-cor.
APA, 6th edition
Transportation of cotton by road : an African American man with a whip riding on top of a flat wagon, loaded with cotton, pulled by oxen, with an African American man standing by the wagon (Box 68). (1918). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/129p2ngf4w-cor.
Chicago
“Transportation of Cotton by Road : an African American Man with a Whip Riding on Top of a Flat Wagon, Loaded with Cotton, Pulled by Oxen, with an African American Man Standing by the Wagon.” Postcards. Robert Langmuir African American Photograph Collection, 1918. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/129p2ngf4w-cor.