MLA
Gibson Merchandise Co. (St. Louis, Mo.). Homer Phillips Hospital for Colored, St. Louis, Missouri [hand colored]. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/38279cnp91-cor.
APA, 6th edition
Gibson Merchandise Co. (St. Louis, Mo.). (unknown)[Homer Phillips Hospital for Colored, St. Louis, Missouri [hand colored]]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/38279cnp91-cor.
Chicago
Gibson Merchandise Co. (St. Louis, Mo.), Homer Phillips Hospital for Colored, St. Louis, Missouri [hand colored], unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/38279cnp91-cor.