MLA
Group Portrait of Three Small African American Girls, One of Them Sitting on a Stool. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 71. https://digital.library.emory.edu/purl/658pc866z1-cor.
APA, 6th edition
Group portrait of three small African American girls, one of them sitting on a stool (Box 71). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/658pc866z1-cor.
Chicago
“Group Portrait of Three Small African American Girls, One of Them Sitting on a Stool.” Photographic postcards. Robert Langmuir African American Photograph Collection, n.d. Box 71. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/658pc866z1-cor.