APA (7th ed.) Citation

Petrides lhGeorge A. & Petrides. Afield guide to western trees: Western United States and Canada.

Chicago Style (17th ed.) Citation

Petrides lhGeorge A. and Petrides. Afield Guide to Western Trees: Western United States and Canada. New York lbHoughton Mifflin lc1998.

MLA (9th ed.) Citation

Petrides lhGeorge A. and Petrides. Afield Guide to Western Trees: Western United States and Canada.

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