MLA
Chapman, Conrad Wise. Lithograph of "The Fifty-Ninth Virginia Infantry - Wise's Brigade, Diascund Bridge - May 1863". Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP26. https://digital.library.emory.edu/purl/945cc2fs6n-cor.
APA, 6th edition
Chapman, C. W. Lithograph of "The Fifty-Ninth Virginia Infantry - Wise's Brigade, Diascund Bridge - May 1863" (OP26) [Engravings (prints)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/945cc2fs6n-cor.
Chicago
Chapman, Conrad Wise. “Lithograph of ‘The Fifty-Ninth Virginia Infantry - Wise's Brigade, Diascund Bridge - May 1863.’” Engravings (prints). Civil War Collection, n.d. OP26. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/945cc2fs6n-cor.