References for John 8th Earl de Warenne * of Surrey
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
D.Schwennicke: Europäische Stammtafeln, I2, Tafeln 227. Marburg, 1999
F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988