MLA
Co., E. C. Kropp. A Study in Black and White : down in Sunny Dixie. 1939. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/8021c5b00b-cor.
APA, 6th edition
Co., E. C. K. (1939). A study in black and white : down in sunny Dixie (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8021c5b00b-cor.
Chicago
Co., E. C. Kropp. “A Study in Black and White : down in Sunny Dixie.” Postcards. Robert Langmuir African American Photograph Collection, 1939. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8021c5b00b-cor.