JOHN CANNON. "Campbell, Sir Colin, 1st Baron Clyde." The Oxford Companion to British History. Oxford University Press. 2002. Encyclopedia.com. 17 Dec. 2009 <http://www.encyclopedia.com>.
JOHN CANNON. "Campbell, Sir Colin, 1st Baron Clyde." The Oxford Companion to British History. Oxford University Press. 2002. Encyclopedia.com. (December 17, 2009). http://www.encyclopedia.com/doc/1O110-CampbellSirColn1stBrnClyd.html
JOHN CANNON. "Campbell, Sir Colin, 1st Baron Clyde." The Oxford Companion to British History. Oxford University Press. 2002. Retrieved December 17, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O110-CampbellSirColn1stBrnClyd.html