References for Richard 5th Earl Marshal * of Pembroke
F.M.Powicke, E.B.Fryde:
Handbook of British Chronology.
London, 1961
D.Schwennicke:
Europäische Stammtafeln, Vol. XIV, Tafel 136.
Marburg, 1991
A.M.Stokvis:
Manuel d'histoire.
Amsterdam, 1966