Gibson, J. R. (1985). Farming the frontier: The agricultural opening of the Oregon country, 1786-1846. University of Washington Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGibson, James R. Farming the Frontier: The Agricultural Opening of the Oregon Country, 1786-1846. Seattle: University of Washington Press, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGibson, James R. Farming the Frontier: The Agricultural Opening of the Oregon Country, 1786-1846. University of Washington Press, 1985.
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