References for Lady Isabella of England

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
J. Dupont, J. Saillot: Cahiers de Saint-Louis. Nantes, Angers, 1976 etc.
M.A.H., Marquis de Ruvigny: The Plantagenet roll of the blood royal, Essex Volume. London, Edinburgh, 1908
D.Schwennicke: Europäische Stammtafeln, Vol. II, Tafel 84. Marburg, 1984
B.Tuchman: The Distant Mirror. Random House, 1978