Winther, O. O. (1950). The old Oregon country: A history of frontier trade, transportation, and travel. Stanford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWinther, Oscar Osburn. The Old Oregon Country: A History of Frontier Trade, Transportation, and Travel. Stanford, Calif.: Stanford University Press, 1950.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWinther, Oscar Osburn. The Old Oregon Country: A History of Frontier Trade, Transportation, and Travel. Stanford University Press, 1950.
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