*[[Willpower: Rediscovering the Greatest Human Strength]] by Roy F. Baumeister and John Tierney. Penguin Press; 1st edition (September 1, 2011) | *[[Willpower: Rediscovering the Greatest Human Strength]] by Roy F. Baumeister and John Tierney. Penguin Press; 1st edition (September 1, 2011) |