MLA
African American Boys and Girls Standing on Railroad Tracks. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/1504xgxd3v-cor.
APA, 6th edition
African American boys and girls standing on railroad tracks (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1504xgxd3v-cor.
Chicago
“African American Boys and Girls Standing on Railroad Tracks.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 72. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/1504xgxd3v-cor.