References for Lady Lucy Percy

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Sir B.Burke: A Genealogical History of the Peerages and Knightages of the British Empire. London, 1953
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
M.A.H., Marquis de Ruvigny: The Plantagenet roll of the blood royal, Essex Volume. London, Edinburgh, 1908
D.Schwennicke: Europäische Stammtafeln, Vol. III/4, Tafel 713. Marburg, 1989