MLA
Two African American Men Sharing a Chair, with Two Women Standing behind Them Holding American Flags, with a Large Flag behind Them. 1919. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/525k98sfc0-cor.
APA, 6th edition
Two African American men sharing a chair, with two women standing behind them holding American flags, with a large flag behind them (Box 71). (1919). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/525k98sfc0-cor.
Chicago
“Two African American Men Sharing a Chair, with Two Women Standing behind Them Holding American Flags, with a Large Flag behind Them.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1919. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/525k98sfc0-cor.