Thucydides I, 114; IV, 57-59, 62.
Ibid., IV, 120-122.
Aristotle, Politics, Book XI, chaps. 7, 8.
J.T. Bent, The Bahrein Islands in the Persian Gulf, Proceedings of the Roy. Geog. Soc., Vol. XII, p. 1. London, 1890.
W.F. Walker, The Azores, p. 22. London, 1886.
A.B. Ellis, West African Islands, p. 203. London, 1885.
Strabo, Book III, chap. V, 1.
H.J. Mackinder, Britain and the British Seas, pp. 10-12. London, 1904.
W.Z. Ripley, Races of Europe, pp. 301, 311. New York, 1899.
H.B. George, Historical Geography of the British Empire, pp. 100, 103, 104. London, 1904.