MLA
Boy Riding a Horse, with an Old Man and Woman next to Him. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 12. https://digital.library.emory.edu/purl/836547d830-cor.
APA, 6th edition
Boy riding a horse, with an old man and woman next to him (Box 12). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/836547d830-cor.
Chicago
“Boy Riding a Horse, with an Old Man and Woman next to Him.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 12. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/836547d830-cor.