References for William 3rd Earl, Count de Mandeville * of Essex * of Aumale

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E. Brandenburg: Die Nachkommen Karls des Grossen. Leipzig 1936, Frankfurt 1964
Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
F.M.Powicke, E.B.Fryde: Handbook of British Chronology. London, 1961
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966