MLA
Sartain, William. Engraving of Confederate General Thomas "Stonewall" Jackson with His Family, Published by Bradly & Co. Bradly & Co., 1866. Stuart A. Rose Manuscript, Archives, and Rare Book Library, OP16. https://digital.library.emory.edu/purl/99351c5c7d-cor.
APA, 6th edition
Sartain, W. (1866). Engraving of Confederate General Thomas "Stonewall" Jackson with his family, published by Bradly & Co. (OP16) [Engravings (prints)]. Bradly & Co.; Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/99351c5c7d-cor.
Chicago
Sartain, William. “Engraving of Confederate General Thomas ‘Stonewall’ Jackson with His Family, Published by Bradly & Co.” Engravings (prints). Civil War Collection. Philadelphia, PA: Bradly & Co., 1866. OP16. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/99351c5c7d-cor.