Pomeroy, E. S., & Etulain, R. W. (2008). The American Far West in the twentieth century. Yale University Press.
Lua i Stíl Chicago (17ú heag.)Pomeroy, Earl S., agus Richard W. Etulain. The American Far West in the Twentieth Century. New Haven: Yale University Press, 2008.
Lua MLA (9ú heag.)Pomeroy, Earl S., agus Richard W. Etulain. The American Far West in the Twentieth Century. Yale University Press, 2008.
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