APA引文

National Geographic Society (U.S.) & Alderfer, J. K. (2006). National Geographic field guide to birds. National Geographic.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.) and Jonathan K. Alderfer. National Geographic Field Guide to Birds. Washington, D.C.: National Geographic, 2006.

MLA引文

National Geographic Society (U.S.) and Jonathan K. Alderfer. National Geographic Field Guide to Birds. National Geographic, 2006.

警告：這些引文格式不一定是100％准確.