Isabella B. Bishop, The Yangtze Valley and Beyond, Vol. I, pp. 26-27. New York and London, 1900.
Fiske, Discovery of America, Vol. I, p. 492. Boston, 1892.
Capt. James Cook, Voyage to the Pacific Ocean, 1776-1780, Vol. II, pp. 321-332. New York, 1796.
John Richard Green, The Making of England, Vol. I, pp. 63-66, 84-86, 95, 96. London, 1904.
E. Lavisse, Histoire de France, Vol. II, Part I, pp. 374-375, 378-379, 381-382, 385-386. Paris, 1903.
Helmolt, History of the World, Vol. I, pp. 189-191, map. New York, 1902-1906.
Ibid., Vol. I, pp. 192-194.
G.W. Kitchen, History of France, Vol. I, pp. 59-60. Oxford, 1892.
Dietrich Schaeffer, Die Hansestädte und König Waldemar von Dänemark, p. 36. Jena, 1879.