MLA
Thomas, Robert. Collecting Pine Gum. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 75. https://digital.library.emory.edu/purl/675r7sqvf2-cor.
APA, 6th edition
Thomas, R. Collecting pine gum (Box 75) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/675r7sqvf2-cor.
Chicago
Thomas, Robert. “Collecting Pine Gum.” 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/675r7sqvf2-cor.