MLA
Co., E. C. Kropp. Main Street, Kissimmee, Fla. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/880ht76hjx-cor.
APA, 6th edition
Co., E. C. K. Main Street, Kissimmee, Fla. (Box 71) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/880ht76hjx-cor.
Chicago
Co., E. C. Kropp. “Main Street, Kissimmee, Fla.” 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/880ht76hjx-cor.