MLA
African American Boy in a Suit Standing next to an African American Girl in a Dress, with a Bow in Her Hair, in Front of a Chair. 1920. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/52259zw3sq-cor.
APA, 6th edition
African American boy in a suit standing next to an African American girl in a dress, with a bow in her hair, in front of a chair (Box 72). (1920). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52259zw3sq-cor.
Chicago
“African American Boy in a Suit Standing next to an African American Girl in a Dress, with a Bow in Her Hair, in Front of a Chair.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1920. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/52259zw3sq-cor.