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. 25 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 25, 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 25, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O110-HwrdChrls2ndBrnHwrdfffngh.html