MLA
Freeman, Daniel. Gen. Henry Forrest on a Horse. 1916. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 52. https://digital.library.emory.edu/purl/279v15dv99-cor.
APA, 6th edition
Freeman, D. (1916). Gen. Henry Forrest on a horse (Box 52) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/279v15dv99-cor.
Chicago
Freeman, Daniel. “Gen. Henry Forrest on a Horse.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, 1916. Box 52. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/279v15dv99-cor.