(en) Edwin Swift Balch, The North Pole and Bradley Land, Philadelphie, Campion and Company, (lire en ligne), p. 54
(en) Frederick A. Cook, My Attainment of the Pole : Being the Record of the Expedition that First Reached the Boreal Center, 1907–1909, New York, The Polar Publishing Co, (lire en ligne), p. 246
