MLA
Walter, A. B. Engraving of Confederate General Robert E. Lee "Sold by the Authority of the Lee Memorial Association for the Erection of a Monument at the Tomb of General Robert E. Lee at Washington & Lee University, Lexington, Virginia". 1870. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP10, Folder 3. https://digital.library.emory.edu/purl/389280gcc1-cor.
APA, 6th edition
Walter, A. B. (1870). Engraving of Confederate General Robert E. Lee "Sold by the authority of the Lee Memorial Association for the erection of a monument at the tomb of General Robert E. Lee at Washington & Lee University, Lexington, Virginia" (OP10, Folder 3) [Engravings (prints)]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/389280gcc1-cor.
Chicago
Walter, A. B. “Engraving of Confederate General Robert E. Lee ‘Sold by the Authority of the Lee Memorial Association for the Erection of a Monument at the Tomb of General Robert E. Lee at Washington & Lee University, Lexington, Virginia.’” Engravings (prints). Civil War Collection, 1870. OP10, Folder 3. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/389280gcc1-cor.