MLA
African American Soldiers Sitting on a Chair behind Their Commanding Officer, All of Them Wearing Uniforms. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/651vdncjz7-cor.
APA, 6th edition
African American soldiers sitting on a chair behind their commanding officer, all of them wearing uniforms (Box 70). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/651vdncjz7-cor.
Chicago
“African American Soldiers Sitting on a Chair behind Their Commanding Officer, All of Them Wearing Uniforms.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/651vdncjz7-cor.