Nash, G. D., & Etulain, R. W. (1989). The Twentieth century West: Historical interpretations. University of New Mexico Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNash, Gerald D., और Richard W. Etulain. The Twentieth Century West: Historical Interpretations. Albuquerque: University of New Mexico Press, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNash, Gerald D., और Richard W. Etulain. The Twentieth Century West: Historical Interpretations. University of New Mexico Press, 1989.
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