References for Piers 8th Earl, 1st Earl Butler * of Ormonde * of Ossory

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Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
F-C. v.Stechow: Nachlese zu Die Stechows und ihre Zeit. Degener, Neustadt/Aisch, 1988
A.M.Stokvis: Manuel d'histoire. Amsterdam, 1966