Mark Twain (2012). “Three by Twain: Tom Sawyer, The Adventures of Huckleberry Finn, and A Connecticut Yankee In King Arther's Court”, p.63, Graphic Arts Books
Interview with reporters (September 30, 2003), as quoted in "Russert ignored White House pledge to fire anyone involved in leaking Plame's identity" by Raphel Schweber-Koren, www.mediamatters.org. July 15, 2007.