MLA
Co., E. C. Kropp. A Cotton Field near Raleigh, N.C. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/2322bvq861-cor.
APA, 6th edition
Co., E. C. K. A cotton field near Raleigh, N.C. (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/2322bvq861-cor.
Chicago
Co., E. C. Kropp. “A Cotton Field near Raleigh, N.C.” 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/2322bvq861-cor.