Richard A. Dienstbier, «Arousal and Physiological Toughness: Implications for Mental and Physical Health», Psychological Review 96, no. 1 (1989):84–100; Richard A. Dienstbier and Lisa M. Pytlik Zillig, «Toughness», in Handbook of Positive Psychology, eds. PG. R. Snyder and Shane J. Lopez (New York: Oxford University Press, 2002), 515–527.
