MLA
Jennings. African American Girl Holding a Toy Horse, While Standing on a Chair. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/402q573n7g-cor.
APA, 6th edition
J. African American girl holding a toy horse, while standing on a chair (Box 72) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/402q573n7g-cor.
Chicago
Jennings. “African American Girl Holding a Toy Horse, While Standing on a Chair.” 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/402q573n7g-cor.