MLA
Co., E. C. Kropp. Taking Life Easy down South : an African American Man Laying in the Back of a Wagon Filled with Cotton, the Wagon Pulled by Two Mules, with Another Wagon in the Background. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/262s4mw6qf-cor.
APA, 6th edition
Co., E. C. K. Taking life easy down south : an African American man laying in the back of a wagon filled with cotton, the wagon pulled by two mules, with another wagon in the background (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/262s4mw6qf-cor.
Chicago
Co., E. C. Kropp. “Taking Life Easy down South : an African American Man Laying in the Back of a Wagon Filled with Cotton, the Wagon Pulled by Two Mules, with Another Wagon in the Background.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/262s4mw6qf-cor.