JOHN CANNON. "Edward, duke of York." A Dictionary of British History. 2004. Encyclopedia.com. 18 Dec. 2009 <http://www.encyclopedia.com>.
JOHN CANNON. "Edward, duke of York." A Dictionary of British History. 2004. Encyclopedia.com. (December 18, 2009). http://www.encyclopedia.com/doc/1O43-EdwarddukeofYork.html
JOHN CANNON. "Edward, duke of York." A Dictionary of British History. 2004. Retrieved December 18, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O43-EdwarddukeofYork.html