MLA
Magovern, and Baker. Portrait of The Original : Addressed to Dr. and Mrs. Wm. H Warwick. 1899. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 25. https://digital.library.emory.edu/purl/750tqjq2gk-cor.
APA, 6th edition
M., & B. (1899). Portrait of The Original : addressed to Dr. and Mrs. Wm. H Warwick (Box 25) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/750tqjq2gk-cor.
Chicago
Magovern, and Baker. “Portrait of The Original : Addressed to Dr. and Mrs. Wm. H Warwick.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, 1899. Box 25. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/750tqjq2gk-cor.