^Cokayne, George Edward, ed. (1896). Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct or dormant (S to T). Vol. 7 (1st ed.). London: Bell. p. 391. Retrieved 2011-12-28.
^Burke, Bernard (1866). A Genealogical History of the Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire. London: Harrison. p. 96.