MLA
Thomas, Robert. Collecting Pine Gum in the Piney Woods of the Southeast. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 75. https://digital.library.emory.edu/purl/8128931zgn-cor.
APA, 6th edition
Thomas, R. Collecting pine gum in the Piney Woods of the Southeast (Box 75) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8128931zgn-cor.
Chicago
Thomas, Robert. “Collecting Pine Gum in the Piney Woods of the Southeast.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 75. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/8128931zgn-cor.