Cita APA (7a ed.)

Billington, R. A. (1968). Westward Expansion: A History of the American Frontier (3rd ed.). The Macmillan Company.

Cita Chicago Style (17a ed.)

Billington, Ray Allen. Westward Expansion: A History of the American Frontier. 3rd ed. New York: The Macmillan Company, 1968.

Cita MLA (9a ed.)

Billington, Ray Allen. Westward Expansion: A History of the American Frontier. 3rd ed. The Macmillan Company, 1968.