MLA
Co., E. C. Kropp. African Americans Picking Cotton [Hand Colored]. 1906. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/7032280gfh-cor.
APA, 6th edition
Co., E. C. K. (1906). African Americans picking cotton [hand colored] (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7032280gfh-cor.
Chicago
Co., E. C. Kropp. “African Americans Picking Cotton [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, 1906. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7032280gfh-cor.