↑(en) Michael Brown The Wars of Scotland 1214~1371 The New Edinburgh History of Scotland IV. Edinburgh University Press, (Edinburgh 2004) (ISBN0748612386) : « The royal house of Scotland 1214-1290 » p. 10.
↑(en) G.W.S. BarrowRobert Bruce and the Community of the Realm of Scotland E.U.P 4e édition (Edinburgh 2005) (ISBN0-7486-2022-2) p. 31.
(en) K.J. Stringer, K (2008). David, Earl of Huntingdon and Lord of Garioch (1152–1219). Oxford Dictionary of National Biography (January 2008 ed.). Oxford University Press.