MLA
Marshall, W. E. Engraving of Union General Ulysses S. Grant. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP14. https://digital.library.emory.edu/purl/9010p2nhqt-cor.
APA, 6th edition
Marshall, W. E. Engraving of Union General Ulysses S. Grant (OP14) [Engravings (prints)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9010p2nhqt-cor.
Chicago
Marshall, W. E. “Engraving of Union General Ulysses S. Grant.” Engravings (prints). Civil War Collection, n.d. OP14. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/9010p2nhqt-cor.