Douglas, D., & Davies, J. (1980). Douglas of the forests: The North American journals of David Douglas. University of Washington Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDouglas, David, और John Davies. Douglas of the Forests: The North American Journals of David Douglas. Seattle: University of Washington Press, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDouglas, David, और John Davies. Douglas of the Forests: The North American Journals of David Douglas. University of Washington Press, 1980.
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