MLA
Kropp, F. C. Old Slave Market, St. Augustine, Fla. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/402q573n7x-cor.
APA, 6th edition
Kropp, F. C. Old slave market, St. Augustine, Fla. (Box 74) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573n7x-cor.
Chicago
Kropp, F. C. “Old Slave Market, St. Augustine, Fla.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 74. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573n7x-cor.