Methods and Vegetation Classification
- John A. Christy, Oregon Biodiversity Information Center, Institute for Natural Resources, Portland State University and Edward R. Alverson, The Nature Conservancy of Oregon. December 2011.
- John A. Christy, Edward R. Alverson, Molly P. Dougherty, Susan C. Kolar, Clifford W. Alton, Susan M. Hawes, Gene Hickman, Jennifer A. Hiebler, Eric M. Nielsen. Oregon Biodiversity Information Center, Institute for Natural Resources, Portland State University. November 2016.