MLA
Plecker, and Maury. Portrait of an African American Man in Graduation Robes and Glasses. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/4816m905tz-cor.
APA, 6th edition
P., & M. Portrait of an African American man in graduation robes and glasses (Box 70) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4816m905tz-cor.
Chicago
Plecker, and Maury. “Portrait of an African American Man in Graduation Robes and Glasses.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4816m905tz-cor.