Worster, D. (1994). Under western skies: Nature and history in the American West. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWorster, Donald. Under Western Skies: Nature and History in the American West. New York: Oxford University Press, 1994.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWorster, Donald. Under Western Skies: Nature and History in the American West. Oxford University Press, 1994.
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