MLA
Brown, Joe L. Cotton Fields near Americus, Ga. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/890rr4xh1t-cor.
APA, 6th edition
Brown, J. L. Cotton fields near Americus, Ga. (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/890rr4xh1t-cor.
Chicago
Brown, Joe L. “Cotton Fields near Americus, Ga.” Photographic 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/890rr4xh1t-cor.