Arno, S. F., & Fiedler, C. E. (2020). Douglas fir: The story of the West's most remarkable tree. Mountaineers Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रArno, Stephen F., और Carl E. Fiedler. Douglas Fir: The Story of the West's Most Remarkable Tree. Seattle, WA: Mountaineers Books, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रArno, Stephen F., और Carl E. Fiedler. Douglas Fir: The Story of the West's Most Remarkable Tree. Mountaineers Books, 2020.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.