APA (7th ed.) Citation

Arno, S. F., & Hammerly, R. P. (2020). Northwest trees: Identifying and understanding the region's native trees (Field guide edition.).

Chicago Style (17th ed.) Citation

Arno, Stephen F., and Ramona P. Hammerly. Northwest Trees: Identifying and Understanding the Region's Native Trees. Field guide edition. Seattle, WA : Mountaineers Books, 2020.

MLA (8th ed.) Citation

Arno, Stephen F., and Ramona P. Hammerly. Northwest Trees: Identifying and Understanding the Region's Native Trees. Field guide edition. 2020.

Warning: These citations may not always be 100% accurate.