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