Roy F. Baumeister and John Tierney, Willpower: Rediscovering the Greatest Human Strength (New York: Penguin, 2011), 99.
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Kathleen D. Vohs et al., «Making Choices Impairs Subsequent Self-Control: A Limited-Resource Account of Decision Making, Self-Regulation, and Active Initiative,» Journal of Personality and Social Psychology 94, no. 5 (2008): 883–98.