References for Thomas 4th/12th Earl de Beauchamp * of Warwick

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
Burke?: ?. F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988