"Definition of a Gentleman". Memorandum found in Lee's papers after his death. "Lee the American" by Gamaliel Bradford, p. 233, xroads.virginia.edu. 1912.
John Esten Cooke, Robert E. Lee (2017). “General Robert E. Lee: The True Story of the Infamous “Marble Man”: The Life & Legacy of Robert E. Lee, Including & Personal Writings, Speeches and Orders”, p.427, Madison & Adams