MLA
Company., Marion Printing. Uncle Abe Wearing an Apron and Hat, Holding a Triangle. 1911. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 70. https://digital.library.emory.edu/purl/996k0p2nmn-cor.
APA, 6th edition
Company., M. P. (1911). Uncle Abe wearing an apron and hat, holding a triangle (Box 70) [Photographic postcards]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/996k0p2nmn-cor.
Chicago
Company., Marion Printing. “Uncle Abe Wearing an Apron and Hat, Holding a Triangle.” Photographic postcards. Robert Langmuir African American Photograph Collection, 1911. Box 70. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/996k0p2nmn-cor.