Gibson, J. R. (1985). Farming the frontier: The agricultural opening of the Oregon country, 1786-1846. University of Washington Press.
Chicago-referens (17:e uppl.)Gibson, James R. Farming the Frontier: The Agricultural Opening of the Oregon Country, 1786-1846. Seattle: University of Washington Press, 1985.
MLA-referens (9:e uppl.)Gibson, James R. Farming the Frontier: The Agricultural Opening of the Oregon Country, 1786-1846. University of Washington Press, 1985.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.