Arno, S. F., & Hammerly, R. P. (2020). Northwest trees: Identifying and understanding the region's native trees (Field guide edition.).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रArno, Stephen F., और Ramona P. Hammerly. Northwest Trees: Identifying and Understanding the Region's Native Trees. Field guide edition. Seattle, WA : Mountaineers Books, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रArno, Stephen F., और Ramona P. Hammerly. Northwest Trees: Identifying and Understanding the Region's Native Trees. Field guide edition. 2020.
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