APA (7th ed.) Citation

Gilkey, H. M., & Packard, P. L. (2001). Winter twigs: A wintertime key to deciduous trees and shrubs of northwestern Oregon and western Washington (Rev. ed.). Oregon State University Press.

Chicago Style (17th ed.) Citation

Gilkey, Helen M., and Patricia L. Packard. Winter Twigs: A Wintertime Key to Deciduous Trees and Shrubs of Northwestern Oregon and Western Washington. Rev. ed. Corvallis: Oregon State University Press, 2001.

MLA (9th ed.) Citation

Gilkey, Helen M., and Patricia L. Packard. Winter Twigs: A Wintertime Key to Deciduous Trees and Shrubs of Northwestern Oregon and Western Washington. Rev. ed. Oregon State University Press, 2001.