Tim Ryan (2012). “A Mindful Nation: How a Simple Practice Can Help Us Reduce Stress, Improve Performance, and Recapture the American Spirit”, p.17, Hay House, Inc
"'Granito: How to Nail a Dictator': New Film Tracks Struggle for Justice After Guatemalan Genocide". Interview with Amy Goodman, www.alternet.org. September 15, 2011.
Tony Robbins (2007). “Awaken the Giant Within: How to Take Immediate Control of Your Mental, Emotional, Physical and Financial”, p.249, Simon and Schuster