From Citizendium - Reading time: 1 min
Jordon, Ross Westerfield. Essentials of Corporate Finance.
Ross, Stephen, Westerfield,Randolph and Jordan, Bradford. Essentials of Corporate Finance. 6. New York: McGraw Hill-Irwin, 2008.
"Risk Premium." Investopedia. 2008. Forbes Media Company. 15 March 2008 <http://www.investopedia.com/terms/r/riskpremium.asp>.