Doig, I. (1976). Early forestry research: A history of the Pacific Northwest Forest & Range Experiment Station, 1925-1975. Forest Service, U.S. Dept. of Agriculture.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDoig, Ivan. Early Forestry Research: A History of the Pacific Northwest Forest & Range Experiment Station, 1925-1975. [Washington: Forest Service, U.S. Dept. of Agriculture, 1976.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDoig, Ivan. Early Forestry Research: A History of the Pacific Northwest Forest & Range Experiment Station, 1925-1975. Forest Service, U.S. Dept. of Agriculture, 1976.
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