MLA
Co., E. C. Kropp. African American Man, Woman and Boys Picking Cotton in a Field in Hot Springs, Arkansas, with a Man on a Horse-Drawn Cart in the Background. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/38279cnp8p-cor.
APA, 6th edition
Co., E. C. K. African American man, woman and boys picking cotton in a field in Hot Springs, Arkansas, with a man on a horse-drawn cart in the background (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/38279cnp8p-cor.
Chicago
Co., E. C. Kropp. “African American Man, Woman and Boys Picking Cotton in a Field in Hot Springs, Arkansas, with a Man on a Horse-Drawn Cart in the Background.” 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/38279cnp8p-cor.