MLA
Co., E. C. Kropp. Slave Huts at the Hermitage, Savannah, Ga. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 74. https://digital.library.emory.edu/purl/518rbnzsb9-cor.
APA, 6th edition
Co., E. C. K. Slave huts at the hermitage, Savannah, Ga. (Box 74) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/518rbnzsb9-cor.
Chicago
Co., E. C. Kropp. “Slave Huts at the Hermitage, Savannah, 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/518rbnzsb9-cor.