MLA
Two African American Bartenders behind a Bar, with Two Men Drinking in Front of It, with a Piano next to Them, and a Picture of Jack Johnson Hanging on the Wall. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 69. https://digital.library.emory.edu/purl/573bzkh1cw-cor.
APA, 6th edition
Two African American bartenders behind a bar, with two men drinking in front of it, with a piano next to them, and a picture of Jack Johnson hanging on the wall (Box 69). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/573bzkh1cw-cor.
Chicago
“Two African American Bartenders behind a Bar, with Two Men Drinking in Front of It, with a Piano next to Them, and a Picture of Jack Johnson Hanging on the Wall.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 69. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/573bzkh1cw-cor.