MLA
Clarke, H. H. Cotton Picking Oklahoma City, Okla. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 68. https://digital.library.emory.edu/purl/815p8cz918-cor.
APA, 6th edition
Clarke, H. H. Cotton picking Oklahoma City, Okla. (Box 68) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/815p8cz918-cor.
Chicago
Clarke, H. H. “Cotton Picking Oklahoma City, Okla.” 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/815p8cz918-cor.