APA (7th ed.) Citation

Leon, G. d. (1989). Explorers of the Americas before Columbus. F. Watts.

Chicago Style (17th ed.) Citation

Leon, George deLucenay. Explorers of the Americas Before Columbus. New York: F. Watts, 1989.

MLA (9th ed.) Citation

Leon, George deLucenay. Explorers of the Americas Before Columbus. F. Watts, 1989.

Warning: These citations may not always be 100% accurate.