MLA
Co., E. C. Kropp. Twin Oaks ... U.S. 17 South ... Brunswick, Ga. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/064tht76m3-cor.
APA, 6th edition
Co., E. C. K. Twin Oaks ... U.S. 17 South ... Brunswick, Ga. (Box 74) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/064tht76m3-cor.
Chicago
Co., E. C. Kropp. “Twin Oaks ... U.S. 17 South ... Brunswick, Ga.” 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/064tht76m3-cor.