References for William 3rd/5th Earl de Burgh * of Ulster
Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
J. Dupont, J. Saillot: Cahiers de Saint-Louis. Nantes, Angers, 1976 etc.
D.Schwennicke: Europäische Stammtafeln, Vol. II, Tafel 83. Marburg, 1984
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966