References for Barbara Duchess, Countess Villiers * of Cleveland * of Southampton

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
J.W. v.Imhof: Regum pariumque Magnae Britanniae historia genealogica, tab 28. Nürnberg, 1690
D.Schwennicke: Europäische Stammtafeln, Vol. III/2, Tafel 367. Marburg, 1983