MLA
Group Shot of Girl and Boys, Some Sitting on Grass, in Front of Triangular Banner. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 11. https://digital.library.emory.edu/purl/7547pvmd22-cor.
APA, 6th edition
Group shot of girl and boys, some sitting on grass, in front of triangular banner (Box 11). [Card photographs (photographs)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7547pvmd22-cor.
Chicago
“Group Shot of Girl and Boys, Some Sitting on Grass, in Front of Triangular Banner.” Card photographs (photographs). Robert Langmuir African American Photograph Collection, n.d. Box 11. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/7547pvmd22-cor.