MLA
National Negro Post Card Co. (Cincinnati, Ohio). Douglas School (Colored), Cincinnati, Ohio. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdr7x6-cor.
APA, 6th edition
National Negro Post Card Co. (Cincinnati, Ohio). (unknown)[Douglas School (Colored), Cincinnati, Ohio]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdr7x6-cor.
Chicago
National Negro Post Card Co. (Cincinnati, Ohio), Douglas School (Colored), Cincinnati, Ohio, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/6386hdr7x6-cor.