MLA
In the Cotton Field: Two African American Men with Bags over Their Shoulders Standing in a Cotton Field with a Basket of Cotton in Front of Each of Them, Two Other African American Men Nearby Picking Cotton and a Man in a Wagon. 1905. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/914nk98sjv-cor.
APA, 6th edition
In the cotton field: two African American men with bags over their shoulders standing in a cotton field with a basket of cotton in front of each of them, two other African American men nearby picking cotton and a man in a wagon (Box 68). (1905). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98sjv-cor.
Chicago
“In the Cotton Field: Two African American Men with Bags over Their Shoulders Standing in a Cotton Field with a Basket of Cotton in Front of Each of Them, Two Other African American Men Nearby Picking Cotton and a Man in a Wagon.” Postcards. Robert Langmuir African American Photograph Collection, 1905. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/914nk98sjv-cor.