MLA
Co., E. C. Kropp. World Champion Cotton Picking Contest : Men and Women Picking Cotton in a Field in Blytheville, Arkansas. 1943. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/716pzgmsfg-cor.
APA, 6th edition
Co., E. C. K. (1943). World champion cotton picking contest : men and women picking cotton in a field in Blytheville, Arkansas (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/716pzgmsfg-cor.
Chicago
Co., E. C. Kropp. “World Champion Cotton Picking Contest : Men and Women Picking Cotton in a Field in Blytheville, Arkansas.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1943. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/716pzgmsfg-cor.