References for Sir Gilbert 7th Earl, 5th Earl, 1st Earl de Clare * of Clare * of Gloucester * of Hertford

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966