APA (7th ed.) Citation

Vail, R. W. G. (1949). The voice of the old frontier. University of Pennsylvania Press.

Chicago Style (17th ed.) Citation

Vail, R. W. G. The Voice of the Old Frontier. Philadelphia: University of Pennsylvania Press, 1949.

MLA (9th ed.) Citation

Vail, R. W. G. The Voice of the Old Frontier. University of Pennsylvania Press, 1949.