References for Sir Hugh 3rd Baron de Courtenay * of Okehampton

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
D.Schwennicke: Europäische Stammtafeln, Vol. III/4, Tafel 629. Marburg, 1989
F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988