MLA
African American Man Wearing a Coat and Hat, Holding a Cane, and a Suitcase Reading Meet Me at Poplar Bluff, Mo., May 24-25-26, Grunners' Assn. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/327mpg4f8b-cor.
APA, 6th edition
African American man wearing a coat and hat, holding a cane, and a suitcase reading Meet me at Poplar Bluff, Mo., May 24-25-26, Grunners' Assn. (Box 71). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/327mpg4f8b-cor.
Chicago
“African American Man Wearing a Coat and Hat, Holding a Cane, and a Suitcase Reading Meet Me at Poplar Bluff, Mo., May 24-25-26, Grunners' Assn.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/327mpg4f8b-cor.