(en) Don Steinberg, « How I Learned to Stop Worrying and Love the Bomb : A Survival Guide to the NFL's Quarterback Rating System », GQ, (lire en ligne)
(en) David M. Nelson, The Anatomy of a Game : Football, the Rules, and the Men Who Made the Game, University of Delaware Press, , 599 p. (ISBN0-87413-455-2, lire en ligne), p. 128.
(en) John Maxymuk, Strong Arm Tactics : A Historical and Statistical Analysis of the Professional Quarterback, McFarland, , 360 p. (ISBN978-0-7864-3277-6, lire en ligne), p. 79.
