MLA
Cotton Being Havested in a Southern Field by an African American Boy [Hand Colored]. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/805fbg79h9-cor.
APA, 6th edition
Cotton being havested in a southern field by an African American boy [hand colored] (Box 68). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/805fbg79h9-cor.
Chicago
“Cotton Being Havested in a Southern Field by an African American Boy [Hand Colored].” 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/805fbg79h9-cor.