"Wendell Potter on “Deadly Spin: An Insurance Company Insider Speaks Out on How Corporate PR is Killing Health Care and Deceiving Americans”". Interview with Amy Goodman, www.democracynow.org. November 16, 2010.
"The Intelligent Investor: The Classic Text on Value Investing". Book by Benjamin Graham. Chapter II, The Investor and Stock-Market Fluctuations, p. 38, 1949.