MLA
Co., E. C. Kropp. How We Love to Work and Play - down in Sunny Dixie. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/788cfxpp15-cor.
APA, 6th edition
Co., E. C. K. How we love to work and play - down in sunny Dixie (Box 71) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/788cfxpp15-cor.
Chicago
Co., E. C. Kropp. “How We Love to Work and Play - down in Sunny Dixie.” 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/788cfxpp15-cor.