References for Hugh 4th Earl of Ross

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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
D.Schwennicke: Europäische Stammtafeln, Vol. II, Tafel 92. Marburg, 1984