MLA
Mammy's Pet : African American Boy next to a Fence. 1905. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/436tx95x7v-cor.
APA, 6th edition
Mammy's pet : African American boy next to a fence (Box 72). (1905). [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/436tx95x7v-cor.
Chicago
“Mammy's Pet : African American Boy next to a Fence.” Postcards. Robert Langmuir African American Photograph Collection, 1905. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/436tx95x7v-cor.