↑Debrett's Peerage, 1968, p. 1077, Duke of Sutherland.
12Doyle,James Edmund(1886).The Official Baronage of England.vol. I.London:Longmans, Green & Co..pp.227
12Cokayne,George Edward(1912).Vicary Gibbs.ed.The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom.vol. II.London:The St Catherine Press Ltd..pp.314
↑Debrett,John(1828).Debrett's Peerage of the United Kingdom of Great Britain and Ireland.vol. I(17th ed.).London:G. Woodfall.pp.102