MLA
St. Louis Greeting Card Co. (St. Louis, Mo.). Homer G. 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/2902z34trh-cor.
APA, 6th edition
St. Louis Greeting Card Co. (St. Louis, Mo.). (unknown)[Homer G. 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/2902z34trh-cor.
Chicago
St. Louis Greeting Card Co. (St. Louis, Mo.), Homer G. 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/2902z34trh-cor.