MLA
African American Man, Woman, and Girl Sitting in Front of a Piano. 1914. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/641mgqnkc7-cor.
APA, 6th edition
African American man, woman, and girl sitting in front of a piano (Box 72). (1914). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/641mgqnkc7-cor.
Chicago
“African American Man, Woman, and Girl Sitting in Front of a Piano.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1914. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/641mgqnkc7-cor.