Capt. A.T. Mahan, Influence of Sea Power upon History, p. 29. New York, 1902.
H.J. Mackinder, Britain and the British Seas, pp. 341, 343. London, 1904.
Ratzel, Die Erde und das Leben, Vol. I, p. 362. Leipzig, 1901.
W.E. Griffis, The Mikado's Empire, Vol. I, p. 258. New York, 1903.
W.F. Walker, The Azores, p. 2. London, 1886.
F.W. Wines, Punishment and Reformation, pp. 166-167, 184-188. New York, 1895.
Tacitus, Annals, Book I, chap. XIII.
Ibid., Book IV, chaps. III, XV. Book II, chap. XIX.
W. Deecke, Italy, pp. 270, 410, 413, 448, 450. London, 1904.
Longmans Gazetteer of the World, Article Easter Isle.