Pell, C., & Goodwin, H. L. 1. (1966). Challenge of the seven seas. New York: William Morrow and Company.
Παραπομπή Chicago StylePell, Claiborne, and Harold L. 1914- Goodwin. Challenge of the Seven Seas. New York: William Morrow and Company, 1966.
Παραπομπή MLAPell, Claiborne, and Harold L. 1914- Goodwin. Challenge of the Seven Seas. New York: William Morrow and Company, 1966.
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