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. 12 Nov. 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. (November 12, 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 November 12, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O110-HwrdChrls2ndBrnHwrdfffngh.html