References for Robert 7th Earl, 20th Lord (Baron), 4th Duke Bertie * of Lindsey * Willoughby de Eresby * of Ancaster and Kesteven

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Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
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