MLA
Commission., Mississippi Advertising. Greetings from Biloxi, Miss. : Mammy's Little Boy Fishes for His Supper. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/863fxpnw26-cor.
APA, 6th edition
Commission., M. A. Greetings from Biloxi, Miss. : Mammy's little boy fishes for his supper (Box 70) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/863fxpnw26-cor.
Chicago
Commission., Mississippi Advertising. “Greetings from Biloxi, Miss. : Mammy's Little Boy Fishes for His Supper.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/863fxpnw26-cor.