Ratzel, History of Mankind, Vol. I, p. 456. London, 1896-1898.
Nordenskiold, Voyage of the Vega, pp. 563, 588, 591. New York, 1882.
A.R. Wallace, Malay Archipelago, pp. 368, 380, 381. New York, 1869.
Richard Semon, In the Australian Bush, pp. 277-278. London,1899.
Strabo, Book VIII, chap. VI, 16.
Pliny, Naturalis Historia, Book IV, 12.
Ibid., Book VI, chap, 32.
Hereford George, Historical Geography of the British Empire, pp. 130-133. London, 1904.
Dietrich Schaefer, Die Hansestädte und König Waldemar von Dänemark, pp. 37-44. Jena, 1879.
Hereford George, Historical Geography of the British Empire, pp. 127-128. London, 1904.