Ashley, W. H., & Johnson, D. R. (1981). British establishments on the Columbia & the state of the fur trade. Ye Galleon Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAshley, William Henry, और Donald R. Johnson. British Establishments on the Columbia & the State of the Fur Trade. Fairfield, Wash.: Ye Galleon Press, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAshley, William Henry, और Donald R. Johnson. British Establishments on the Columbia & the State of the Fur Trade. Ye Galleon Press, 1981.
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