Andrew Weil, M.D. (2011). “Spontaneous Healing: How to Discover and Enhance Your Body's Natural Ability to Maintain and Heal Itself”, p.127, Ballantine Books
"Johann Hari: 'I failed badly. When you harm people, you should shut up, go away and reflect on what happened'". Interview with Decca Aitkenhead, www.theguardian.com. January 2, 2015.