MLA
Co., E. C. Kropp. A Yard of Contentment : African American Boy Eating Watermelon. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/0924b8gtn2-cor.
APA, 6th edition
Co., E. C. K. A yard of contentment : African American boy eating watermelon (Box 69) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0924b8gtn2-cor.
Chicago
Co., E. C. Kropp. “A Yard of Contentment : African American Boy Eating Watermelon.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 69. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/0924b8gtn2-cor.