APA (7th ed.) Citation

Billington, R. A. (1965). The American frontier (2nd ed.). Service Center for Teachers of History.

Chicago Style (17th ed.) Citation

Billington, Ray Allen. The American Frontier. 2nd ed. Washington: Service Center for Teachers of History, 1965.

MLA (9th ed.) Citation

Billington, Ray Allen. The American Frontier. 2nd ed. Service Center for Teachers of History, 1965.