References for Constance de Beaumont
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
D.Schwennicke: Europäische Stammtafeln, Vol. III/4, Tafel 687. Marburg, 1989
F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988