MLA
Green, R. C. Group of African American Professionals Posing for Photograph in Front of Building. 1934. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 15. https://digital.library.emory.edu/purl/805fbg79kw-cor.
APA, 6th edition
Green, R. C. (1934). Group of African American professionals posing for photograph in front of building (Box 15) [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/805fbg79kw-cor.
Chicago
Green, R. C. “Group of African American Professionals Posing for Photograph in Front of Building.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, 1934. Box 15. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/805fbg79kw-cor.