Cita APA

Billington, R. A. 1., & Hedges, J. B. 1. (1974). Westward expansion: A history of the American frontier (4. edition.). New York: Macmillan Publishing Co., INC..

Citación estilo Chicago

Billington, Ray Allen 1903-1981, y James Blaine 1894-1965 Hedges. Westward Expansion: A History of the American Frontier. 4. edition. New York: Macmillan Publishing Co., INC., 1974.

Cita MLA

Billington, Ray Allen 1903-1981, y James Blaine 1894-1965 Hedges. Westward Expansion: A History of the American Frontier. 4. edition. New York: Macmillan Publishing Co., INC., 1974.