MLA
Stanfield. Uncle Billy Boyd, 100 Years Old, Cleveland, Tenn. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/392g79cnrg-cor.
APA, 6th edition
S. Uncle Billy Boyd, 100 years old, Cleveland, Tenn. (Box 72) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/392g79cnrg-cor.
Chicago
Stanfield. “Uncle Billy Boyd, 100 Years Old, Cleveland, Tenn.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/392g79cnrg-cor.