MLA
Brown, H. W. Picking Cotton. 1909. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/723hx3fffn-cor.
APA, 6th edition
Brown, H. W. (1909). Picking cotton (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/723hx3fffn-cor.
Chicago
Brown, H. W. “Picking Cotton.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1909. Box 68. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/723hx3fffn-cor.