MLA
Pruss' Photo Postal Studio (St. Louis, Mo.). African American man in front of a train backdrop of Wabash leaving St. Louis. unknown. Robert Langmuir African American Photograph Collection. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/713905qfxh-cor.
APA, 6th edition
Pruss' Photo Postal Studio (St. Louis, Mo.). (unknown)[African American man in front of a train backdrop of Wabash leaving St. Louis]. Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/713905qfxh-cor.
Chicago
Pruss' Photo Postal Studio (St. Louis, Mo.), African American man in front of a train backdrop of Wabash leaving St. Louis, unknown, Robert Langmuir African American Photograph Collection, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/713905qfxh-cor.