MLA
Valentine, and Sons. A Florida Pickaninny : an African American Girl Sitting in a Chair. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 72. https://digital.library.emory.edu/purl/146qz612m2-cor.
APA, 6th edition
V., & S. A Florida Pickaninny : an African American girl sitting in a chair (Box 72) [Postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/146qz612m2-cor.
Chicago
Valentine, and Sons. “A Florida Pickaninny : an African American Girl Sitting in a Chair.” 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/146qz612m2-cor.