MLA
Portrait of Charles E. [?] by the Photographer Shepherd. 1900. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 16. https://digital.library.emory.edu/purl/38279cnpgx-cor.
APA, 6th edition
Portrait of Charles E. [?] by the photographer Shepherd (Box 16). (1900). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/38279cnpgx-cor.
Chicago
“Portrait of Charles E. [?] by the Photographer Shepherd.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, 1900. Box 16. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/38279cnpgx-cor.