^Tytler, Patrick, The History of Scotland, new edition, Edinburgh, 1866, vol.ii, alternates between calling him the Earl of Dunbar and the Earl of March
^Miller, James, The History of Dunbar, Haddington, 1830: 35
^Brown, Peter, publisher, The Peerage of Scotland, Edinburgh, 1834:145
^Bain, FSA (Scot), &c., Joseph, editor, Calendar of Documents relating to Scotland, vol.iv, 1357-1509, Edinburgh, 1888, p. 608
^Anderson, William, The Scottish Nation, Edinburgh, 1867, vol.iv:74
^Harvey, Charles C.H. & MacLeod, John, editors, Calendar of Writs preserved at Yester House 1166-1625Scottish Record Society, Edinburgh, 1930, p. 17, no.22, where he has signed a charter dated 8 September 1346 as "Patricio de Dunbar Comite Marchie"