References for Roger 2nd Earl le Bigod * of Norfolk

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
J.W. v.Imhof: Regum pariumque Magnae Britanniae historia genealogica, tab 16. Nürnberg, 1690
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961