↑ Detlev Schwennicke, Europäische Stammtafeln: Stammtafeln zur Geschichte der Europäischen Staaten, Neue Folge, Band III Teilband 4 (Marburg, Germany: Verlag von J. A. Stargardt, 1989), Tafel 621
↑ George Edward Cokayne, The Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, Extant Extinct or Dormant, Vol. I, ed. Vicary Gibbs (London: The St. Catherine Press, Ltd., 1910), pp. 351–2
↑ Detlev Schwennicke, Europäische Stammtafeln: Stammtafeln zur Geschichte der Europäischen Staaten, Neue Folge, Band III Teilband 4 (Marburg, Germany: Verlag von J. A. Stargardt, 1989), Tafel 653
↑ James Robinson Planché, The Conqueror and his companions, Vol. 1 (London: Tinsley Brothers, 1874), p. 122
↑ George Edward Cokayne, The Complete Peerage of England Scotland Ireland Great Britain and the United Kingdom, Extant Extinct or Dormant, Vol. I, ed. Vicary Gibbs (London: The St. Catherine Press, Ltd., 1910), pp. 352