JOHN CANNON. "Howard, Charles, 2nd Baron Howard of Effingham and 1st earl of Nottingham." The Oxford Companion to British History. Oxford University Press. 2002. Encyclopedia.com. 1 Dec. 2009 <http://www.encyclopedia.com>.
JOHN CANNON. "Howard, Charles, 2nd Baron Howard of Effingham and 1st earl of Nottingham." The Oxford Companion to British History. Oxford University Press. 2002. Encyclopedia.com. (December 1, 2009). http://www.encyclopedia.com/doc/1O110-HwrdChrls2ndBrnHwrdfffngh.html
JOHN CANNON. "Howard, Charles, 2nd Baron Howard of Effingham and 1st earl of Nottingham." The Oxford Companion to British History. Oxford University Press. 2002. Retrieved December 01, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O110-HwrdChrls2ndBrnHwrdfffngh.html