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
Richard T. Pascale, Jerry Sternin, Monique Sternin (2010). “The Power of Positive Deviance: How Unlikely Innovators Solve the World's Toughest Problems”, p.112, Harvard Business Press