APA (7th ed.) Citation

Guilbert, D. C., & Teakle, T. Northwest -- Trees.

Chicago Style (17th ed.) Citation

Guilbert, David C., and Thomas Teakle. Northwest -- Trees.

MLA (8th ed.) Citation

Guilbert, David C., and Thomas Teakle. Northwest -- Trees.

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