Cita APA (7th ed.)

Billington, R. A. (1962). The Far Western frontier, 1830-1860. Harper & Row.

Cita Chicago (17th ed.)

Billington, Ray Allen. The Far Western Frontier, 1830-1860. New York: Harper & Row, 1962.

Cita MLA (8th ed.)

Billington, Ray Allen. The Far Western Frontier, 1830-1860. Harper & Row, 1962.