APA (7th ed.) Citation

Gordon, C. H. (1971). Before Columbus: Links between the Old World and ancient America. Crown.

Chicago Style (17th ed.) Citation

Gordon, Cyrus Herzl. Before Columbus: Links Between the Old World and Ancient America. New York: Crown, 1971.

MLA (8th ed.) Citation

Gordon, Cyrus Herzl. Before Columbus: Links Between the Old World and Ancient America. Crown, 1971.