References for Llywelyn II. ou Galles

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O.F. Buck, T.F. Beard: Pedigrees of Some of the Emperor Charlemagne's Descendants, Vol III., S.. Baltimore:Genealogical Publishing Co, 2002
Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
J. Dupont, J. Saillot: Cahiers de Saint-Louis. Nantes, Angers, 1976 etc.
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966
A.Taute: The Kings and Queens of Great Britain. London, 1970
F.L.Weis: Ancestral Roots of Sixty Colonists. 6th Ed., Baltimore, 1988