"In the Time of Gods : A Conversation With Dar Williams, Plus Chatting With The Sweet’s Andy Scott and Steve Barton". Interview with Mike Ragogna, www.huffingtonpost.com. June 11, 2012.
Richard T. Pascale, Jerry Sternin, Monique Sternin (2010). “The Power of Positive Deviance: How Unlikely Innovators Solve the World's Toughest Problems”, p.146, Harvard Business Press