APA (7th ed.) Citation

Dunn, J. L., & Alderfer, J. K. (2008). National Geographic field guide to the birds of western North America. National Geographic.

Chicago Style (17th ed.) Citation

Dunn, Jon L., and Jonathan K. Alderfer. National Geographic Field Guide to the Birds of Western North America. Washington, D.C.: National Geographic, 2008.

MLA (8th ed.) Citation

Dunn, Jon L., and Jonathan K. Alderfer. National Geographic Field Guide to the Birds of Western North America. National Geographic, 2008.

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