MLA
Lithographers., Associated. Hope, Arkansas : Home of the World's Largest Watermelon. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/3483j9kd7w-cor.
APA, 6th edition
Lithographers., A. Hope, Arkansas : home of the world's largest watermelon (Box 69) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/3483j9kd7w-cor.
Chicago
Lithographers., Associated. “Hope, Arkansas : Home of the World's Largest Watermelon.” 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/3483j9kd7w-cor.