References for Roger 4th Earl le Bigod * of Norfolk

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
W.K. v.Isenburg: Europäische Stammtafeln, Band II, Tafel 67. Marburg, 1953 (1965)
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
D.Schwennicke: Europäische Stammtafeln, Vol. II, Tafel 90. Marburg, 1984
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966