References for Joan (Elizabeth) de Beauchamp

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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
Burke?: ?. F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988