References for (Maurice) Harold 1st Earl Macmillan * of Stockton

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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
Gothaischer genealogischer Hofkalender auf das Jahr 1929. J.Perthes, Gotha, 1928