References for Gerald FitzWalter

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966
F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988