MLA
Blackshear. Portrait of B. Jeffery in Uniform with United States Volunteers Pin. 1899. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 19. https://digital.library.emory.edu/purl/160cvdncz2-cor.
APA, 6th edition
B. (1899). Portrait of B. Jeffery in uniform with United States Volunteers pin (Box 19) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/160cvdncz2-cor.
Chicago
Blackshear. “Portrait of B. Jeffery in Uniform with United States Volunteers Pin.” Card photographs (photographs). Langmuir Deposit - Sept 2020, 1899. Box 19. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/160cvdncz2-cor.