Cita APA (7a ed.)

Billington, R. A. (1956). The Far Western frontier, 1830-1860. Harper & Brothers.

Cita Chicago Style (17a ed.)

Billington, Ray Allen. The Far Western Frontier, 1830-1860. New York: Harper & Brothers, 1956.

Cita MLA (9a ed.)

Billington, Ray Allen. The Far Western Frontier, 1830-1860. Harper & Brothers, 1956.