References for Henry I. 2nd Earl Beaufort * of Somerset
Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
J. Dupont, J. Saillot: Cahiers de Saint-Louis. Nantes, Angers, 1976 etc.
D.Schwennicke: Europäische Stammtafeln, Vol. III/1, Tafel 157. Marburg, 1984