APA (7th ed.) Citation

Pomeroy, E. S., & Etulain, R. W. (2008). The American Far West in the twentieth century. Yale University Press.

Chicago Style (17th ed.) Citation

Pomeroy, Earl S., and Richard W. Etulain. The American Far West in the Twentieth Century. New Haven: Yale University Press, 2008.

MLA (9th ed.) Citation

Pomeroy, Earl S., and Richard W. Etulain. The American Far West in the Twentieth Century. Yale University Press, 2008.