MLA
Engraving of "Lee and His Generals," Published by Andrew B. Graham Co. Andrew B. Graham Co., 1907. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP21. https://digital.library.emory.edu/purl/5977sqvc1h-cor.
APA, 6th edition
Engraving of "Lee and His Generals," published by Andrew B. Graham Co. (OP21). (1907). [Lithgraphs]. Andrew B. Graham Co.; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/5977sqvc1h-cor.
Chicago
“Engraving of ‘Lee and His Generals," Published by Andrew B. Graham Co.” Lithgraphs. Civil War Collection. Washington D. C.: Andrew B. Graham Co., 1907. OP21. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/5977sqvc1h-cor.