MLA
Boys and Girls Posing on and in Front of a Playground, in New London, Connecticut. 1911. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/829b5mkkzf-cor.
APA, 6th edition
Boys and girls posing on and in front of a playground, in New London, Connecticut (Box 72). (1911). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/829b5mkkzf-cor.
Chicago
“Boys and Girls Posing on and in Front of a Playground, in New London, Connecticut.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1911. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/829b5mkkzf-cor.