MLA
Co., E. C. Kropp. Taking a Sun Bath on a Lily Pad, in Beautiful Florida, McKee Jungle Gardens, Vero Beach [Hand Colored]. 1950. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/163stqjq43-cor.
APA, 6th edition
Co., E. C. K. (1950). Taking a sun bath on a lily pad, in beautiful Florida, McKee Jungle Gardens, Vero Beach [hand colored] (Box 72) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/163stqjq43-cor.
Chicago
Co., E. C. Kropp. “Taking a Sun Bath on a Lily Pad, in Beautiful Florida, McKee Jungle Gardens, Vero Beach [Hand Colored].” Postcards. Robert Langmuir African American Photograph Collection, 1950. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/163stqjq43-cor.