References for Sir William 1st Lord (Baron) la Zouche (de Mortimer)

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Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
D.Schwennicke: Europäische Stammtafeln, Vol. III/4, Tafel 706. Marburg, 1989
F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988