MLA
African American Men and Women Picking Cotton in Alexandria Valley, Alabama. 1890. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/040xpnvx36-cor.
APA, 6th edition
African American men and women picking cotton in Alexandria Valley, Alabama (Box 68). (1890). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/040xpnvx36-cor.
Chicago
“African American Men and Women Picking Cotton in Alexandria Valley, Alabama.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1890. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/040xpnvx36-cor.