References for Charles 1st Earl, 3rd Duke? Butler * of Arran * of Ormonde

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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
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966