MLA
Man in Uniform Holding Reins of Horse in Front of a Man, Tent and More Horses . Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19. https://digital.library.emory.edu/purl/218dfn2zfr-cor.
APA, 6th edition
Man in uniform holding reins of horse in front of a man, tent and more horses (Box 19). [Black-and-white photographs]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/218dfn2zfr-cor.
Chicago
“Man in Uniform Holding Reins of Horse in Front of a Man, Tent and More Horses .” Black-and-white photographs. Robert Langmuir African American Photograph Collection, n.d. Box 19. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/218dfn2zfr-cor.