MLA
African American Man next to a Horse-Drawn U.S. Mail Carriage. 1908. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/590dv41nwq-cor.
APA, 6th edition
African American man next to a horse-drawn U.S. mail carriage (Box 71). (1908). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/590dv41nwq-cor.
Chicago
“African American Man next to a Horse-Drawn U.S. Mail Carriage.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1908. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/590dv41nwq-cor.