APA (7th ed.) Citation

Alderfer, J. K., & Hess, P. (2011). National Geographic backyard guide to the birds of North America. National Geographic.

Chicago Style (17th ed.) Citation

Alderfer, Jonathan K., and Paul Hess. National Geographic Backyard Guide to the Birds of North America. Washington, D.C.: National Geographic, 2011.

MLA (8th ed.) Citation

Alderfer, Jonathan K., and Paul Hess. National Geographic Backyard Guide to the Birds of North America. National Geographic, 2011.

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