MLA
Valentine, and Sons. In the Cotton Field : an African American Woman in a Cotton Field [Hand Colored]. 1921. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/491fj6q5b5-cor.
APA, 6th edition
V., & S. (1921). In the cotton field : an African American woman in a cotton field [hand colored] (Box 68) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/491fj6q5b5-cor.
Chicago
Valentine, and Sons. “In the Cotton Field : an African American Woman in a Cotton Field [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, 1921. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/491fj6q5b5-cor.