ISBN 1-871615-03-8* Broun, Dauvit, "Duncan I (d. 1040)", "Oxford Dictionary of National Biography", Oxford University Press, 2004 accessed 15 May 2007* Duncan, A.
ISBN 1-871615-03-8* Broun, Dauvit, «Duncan I (d. 1040)», "Oxford Dictionary of National Biography", Oxford University Press, 2004 [http://www.oxforddnb.com/view/article/8209]* Duncan, A.