APA (7th ed.) Citation

Petrides, G. A., & Wehr, J. (1998). A field guide to eastern trees: Eastern United States and Canada, including the Midwest (1st ed., expanded.). Houghton Mifflin.

Chicago Style (17th ed.) Citation

Petrides, George A., and Janet Wehr. A Field Guide to Eastern Trees: Eastern United States and Canada, Including the Midwest. 1st ed., expanded. Boston: Houghton Mifflin, 1998.

MLA (9th ed.) Citation

Petrides, George A., and Janet Wehr. A Field Guide to Eastern Trees: Eastern United States and Canada, Including the Midwest. 1st ed., expanded. Houghton Mifflin, 1998.