References for John 1st Earl Stewart * of Atholl

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E. Brandenburg: Die Ahnen Karl Augusts von Sachsen-Weimar. Abh. der Sächs. Akademie der Wissenschaften, Phil-Hist.Klasse, Vol.44, No.4, 1938?
Sir B.Burke: The Dormant and Extinct Peerage. London, 1866
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999
Sir B.Burke: Burke's Peerage and Baronetage. London, 1999