References for William 6th Earl Keith * Marischal

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H. Banniza v.Bazan, R. Müller: Deutsche Geschichte in Ahnentafeln, S.213. Alfred Metzner Verlag, Berlin, 1939
Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999