Utley, R. M. (1997). A life wild and perilous: Mountain men and the paths to the Pacific. Henry Holt and Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUtley, Robert M. A Life Wild and Perilous: Mountain Men and the Paths to the Pacific. New York: Henry Holt and Co., 1997.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUtley, Robert M. A Life Wild and Perilous: Mountain Men and the Paths to the Pacific. Henry Holt and Co., 1997.
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