MLA
Teich, Curt, and Co. Levee Chocolate Drops, Quincy, Ill. : African American Boys Eating Watermelons. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/443nvx0k82-cor.
APA, 6th edition
Teich, C., & C. Levee chocolate drops, Quincy, Ill. : African American boys eating watermelons (Box 72) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/443nvx0k82-cor.
Chicago
Teich, Curt, and Co. “Levee Chocolate Drops, Quincy, Ill. : African American Boys Eating Watermelons.” Postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/443nvx0k82-cor.