APA引文

National Geographic Society (U.S.), Dunn, J. L., & Alderfer, J. K. (2011). National Geographic field guide to the birds of North America (Sixth edition.). National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.), Jon L. Dunn, and Jonathan K. Alderfer. National Geographic Field Guide to the Birds of North America. Sixth edition. Washington, D.C.: National Geographic Society, 2011.

MLA引文

National Geographic Society (U.S.), et al. National Geographic Field Guide to the Birds of North America. Sixth edition. National Geographic Society, 2011.

警告：這些引文格式不一定是100％准確.