MLA
Teich, Curt, and Co. Men and Women Picking Cotton in a Field in Arkansas, with a Man Sitting on a Horse, and Another Standing on a Cart. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/170msbcc54-cor.
APA, 6th edition
Teich, C., & C. Men and women picking cotton in a field in Arkansas, with a man sitting on a horse, and another standing on a cart (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/170msbcc54-cor.
Chicago
Teich, Curt, and Co. “Men and Women Picking Cotton in a Field in Arkansas, with a Man Sitting on a Horse, and Another Standing on a Cart.” 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/170msbcc54-cor.