Williams, G. W. (2009). The U.S. Forest Service in the Pacific Northwest: A history. Oregon State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Gerald W. The U.S. Forest Service in the Pacific Northwest: A History. Corvallis, OR: Oregon State University Press, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilliams, Gerald W. The U.S. Forest Service in the Pacific Northwest: A History. Oregon State University Press, 2009.
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