MacLeod, The ScottishWar of Independence: A Critical Study, 2nd Edition, (Inverness, 1934). Barrow, G. W. S., The Anglo-Norman Era in Scottish History, (Oxford
Library of Norway (in Norwegian), accessdate=2010-12-10 [5], Norsk biografisk leksikon-Norwegian Biografical encyclopedia (in Norwegian), accessdate=2010-12-10
English by A. G. Chater, and published as The South Pole: An Account of the Norwegian Antarctic Expedition in the "Fram," 1910–1912. (London: John Murray. 1912)