2012年3月9日閲覧。 ^ a b Langner, Rainer-K. (trans. Beech, Timothy) (2007). Scott and Amundsen: Duel in the Ice, p. 120. London: Haus Publishing. ISBN 1-905791-08-9.
maps about the Northwest Passage, particularly the 1845 Franklin and 1903 Amundsen expeditions Exploration of the Northwest Passage The Sir John Franklin