Bruce, D., & Cowlin, R. W. (1968). Timber measurement problems in the Douglas-fir region of Washington and Oregon. Pacific Northwest Forest and Range Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBruce, David, और Robert W. Cowlin. Timber Measurement Problems in the Douglas-fir Region of Washington and Oregon. [Portland, Or.]: Pacific Northwest Forest and Range Experiment Station, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBruce, David, और Robert W. Cowlin. Timber Measurement Problems in the Douglas-fir Region of Washington and Oregon. Pacific Northwest Forest and Range Experiment Station, 1968.
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