MLA
Portrait of an African American Man with a Mustache with His Hand on a Chair. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 73. https://digital.library.emory.edu/purl/4407wm37s0-cor.
APA, 6th edition
Portrait of an African American man with a mustache with his hand on a chair (Box 73). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4407wm37s0-cor.
Chicago
“Portrait of an African American Man with a Mustache with His Hand on a Chair.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 73. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/4407wm37s0-cor.