MLA
Cannon, W. F. Cotton Field near Orangeburg, S.C. 1906. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/784zgmsbgr-cor.
APA, 6th edition
Cannon, W. F. (1906). Cotton field near Orangeburg, S.C. (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/784zgmsbgr-cor.
Chicago
Cannon, W. F. “Cotton Field near Orangeburg, S.C.” Photographic 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/784zgmsbgr-cor.