MLA
African American Boy on a Pony next to Santa. 1929. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/1848pk0p42-cor.
APA, 6th edition
African American boy on a pony next to Santa (Box 72). (1929). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1848pk0p42-cor.
Chicago
“African American Boy on a Pony next to Santa.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1929. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1848pk0p42-cor.