References for Margaret de Nevil

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O.F. Buck, T.F. Beard: Pedigrees of Some of the Emperor Charlemagne's Descendants, Vol III., S.29. Baltimore:Genealogical Publishing Co, 2002
Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999