APA (7th ed.) Citation

Billington, R. A. (1958). The American frontier. Service Center for Teachers of History.

Chicago Style (17th ed.) Citation

Billington, Ray Allen. The American Frontier. Washington: Service Center for Teachers of History, 1958.

MLA (9th ed.) Citation

Billington, Ray Allen. The American Frontier. Service Center for Teachers of History, 1958.

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