MLA
African American Baby Girl Sitting on a Chair, with an African American Girl and Boy Standing next to Her. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/904dncjt09-cor.
APA, 6th edition
African American baby girl sitting on a chair, with an African American girl and boy standing next to her (Box 72). [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/904dncjt09-cor.
Chicago
“African American Baby Girl Sitting on a Chair, with an African American Girl and Boy Standing next to Her.” 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/904dncjt09-cor.