Boyd Alexander, From the Niger to the Nile, Vol. I, p. 167. London; 1907.

Ibid., Vol. I, p. 324.

James H. Breasted, History of Egypt, pp. 89, 91, 97. New York, 1905. Col. Lane Fox, Early Modes of Navigation, Journal of Anthropological Institute, Vol. IV, pp. 414-417.

G. Schweinfurth, The Heart of Africa, Vol. I, p. 77. London, 1873.

E. Huntington, The Depression of Sistan in Eastern Persia, Bulletin of the American Geographical Society, Vol. 37, No. 5. 1905.

Schoolcraft, The Indian Tribes of the United States, Vol. I, p. 214. Philadelphia, 1853.

H.H. Bancroft, The Native Races, Vol. I, pp. 382-383, 408, 564. San Francisco, 1886. D. G. Brinton, The American Race, pp. 110, 112. Philadelphia, 1901.

Herodotus, Book 1, Chap. 194.

S.M. Zwemer, Arabia the Cradle of Islam, p. 135. New York, 1900.

Cotterill and Little, Ships and Sailors, pp. ix-x, 38, London, 1868.