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. 9 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 9, 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 09, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O110-DglsrchbldDgls4thrlfSlrdf.html