"The Willpower Instinct: How Self-Control Works, Why It Matters, and What You Can Do to Get More of It". Book by Kelly McGonigal, www.businessinsider.com. December 29, 2011.
"Jane Fonda, Fitness Guru, Reveals What Inspires Her In Origin Magazine Interview". Interview with Maranda Pleasant, www.huffingtonpost.com. February 15, 20013.