APA (7th ed.) Citation

National Geographic Society (U.S.). (1987). Field guide to the birds of North America (2nd ed.). National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). Field Guide to the Birds of North America. 2nd ed. Washington, D.C.: National Geographic Society, 1987.

MLA (9th ed.) Citation

National Geographic Society (U.S.). Field Guide to the Birds of North America. 2nd ed. National Geographic Society, 1987.