"Warren Buffett: I Haven't Seen As Much Economic Fear In My Adult Lifetime - Charlie Rose Interview". Interview with Charlie Rose, www.cnbc.com. October 1, 2008.
Lawrence A. Cunningham, Warren E. Buffett (2013). “The Essays of Warren Buffett: Lessons for Corporate America (Third Edition)”, p.63, Carolina Academic Press
Lawrence A. Cunningham, Warren E. Buffett (2013). “The Essays of Warren Buffett: Lessons for Corporate America (Third Edition)”, p.71, Carolina Academic Press
Lawrence A. Cunningham, Warren E. Buffett (2013). “The Essays of Warren Buffett: Lessons for Corporate America (Third Edition)”, p.63, Carolina Academic Press