MLA
Chessler Co. (Baltimore, Md.). Mammy : a portrait of an African American woman wearing a dress and headwrap [hand colored]. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/627zkh18ch-cor.
APA, 6th edition
Chessler Co. (Baltimore, Md.). (unknown)[Mammy : a portrait of an African American woman wearing a dress and headwrap [hand colored]]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/627zkh18ch-cor.
Chicago
Chessler Co. (Baltimore, Md.), Mammy : a portrait of an African American woman wearing a dress and headwrap [hand colored], unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/627zkh18ch-cor.