Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996). Handbook of British Chronology (Third revised ed.). Cambridge: Cambridge University Press.
ISBN0-521-56350-X.
Weir, AlisonQueen Isabella: Treachery, Adultery and Murder in Medieval England New York: Ballantine 2005
ISBN0-345-45319-0
External links
Hutchinson, John (1892). "Stephen of Gravesend" . Men of Kent and Kentishmen (Subscription ed.). Canterbury: Cross & Jackman. p. 128.