MLA
Co., E. C. Kropp. Oldest School House, St. George Street, St. Augustine, Florida. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/204rjdfn67-cor.
APA, 6th edition
Co., E. C. K. Oldest school house, St. George Street, St. Augustine, Florida (Box 71) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/204rjdfn67-cor.
Chicago
Co., E. C. Kropp. “Oldest School House, St. George Street, St. Augustine, Florida.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/204rjdfn67-cor.