References: - U.S. War Department, The War of the Rebellion: a Compilation of the Official Records of the Union and Confederate Armies. Washington, DC: U.S. Government Printing Office, 1880–1901. - The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies, 70 vols. in 128 parts (Washington: Government Printing Office, 1880-1901), series 1, vol. 25, pt. 2, p. 12; Halleck to Burnside, January 7, 1863, ibid., vol. 21, pp. 953-54 - The Wartime Papers of Robert E. Lee, Da Capo Press (March 21, 1987) - The American Civil War: A collection of free online primary sources: https://crln.acrl.org/index.php/crlnews/article/view/9314/10416 - https://www.battlefields.org/learn/primary-sources/letter-gen-robert-e-lee-confederate-president-jefferson-davis - Grant and Lee: A Study in Personality and Generalship, Indiana University Press; Reprint edition (October 22, 1982)