Ervin, K. (1989). Fragile majesty: The battle for North America's last great forest. The Mountaineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रErvin, Keith. Fragile Majesty: The Battle for North America's Last Great Forest. Seattle: The Mountaineers, 1989.
एमएलए (8वां संस्करण) प्रशस्ति पत्रErvin, Keith. Fragile Majesty: The Battle for North America's Last Great Forest. The Mountaineers, 1989.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.