M. T. Gailliot, R. F. Baumeister, C. N. DeWall, J. K. Maner, E. A. Plant, D. M. Tice, et al., «Self-Control Relies on Glucose as a Limited Energy Source: Willpower Is More Than a Metaphor», Journal of Personality and Social Psychology 92, no. 2 (2007): 325–36.