Helmolt, Hans F., ed. (1903). The history of the world; a survey of a man's record, Volume III: West Asia and Africa. New York: Dodd, Meade and Company. p. 538. OCLC1193060.
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Helmolt, Hans F., ed. (1903). The history of the world; a survey of a man's record, Volume III: West Asia and Africa. New York: Dodd, Meade and Company. p. 538. OCLC1193060.
