JOHN CANNON. "Douglas, Archibald Douglas, 4th earl of (S), lord of Galloway and Annandale, duke of Touraine." The Oxford Companion to British History. Oxford University Press. 2002. Encyclopedia.com. 26 Nov. 2009 <http://www.encyclopedia.com>.
JOHN CANNON. "Douglas, Archibald Douglas, 4th earl of (S), lord of Galloway and Annandale, duke of Touraine." The Oxford Companion to British History. Oxford University Press. 2002. Encyclopedia.com. (November 26, 2009). http://www.encyclopedia.com/doc/1O110-DglsrchbldDgls4thrlfSlrdf.html
JOHN CANNON. "Douglas, Archibald Douglas, 4th earl of (S), lord of Galloway and Annandale, duke of Touraine." The Oxford Companion to British History. Oxford University Press. 2002. Retrieved November 26, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O110-DglsrchbldDgls4thrlfSlrdf.html