^Debrett's Peerage, 1968, p. 1077, Duke of Sutherland.
^ abDoyle, James Edmund (1886). The Official Baronage of England. vol. I. London: Longmans, Green & Co.. pp. 227
^ abCokayne, 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