APA引文

National Geographic Society (U.S.) & Thompson, J. M. Washington, D.C. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.) and John M. Thompson. Washington, D.C. Washington, D.C.: National Geographic Society.

MLA引文

National Geographic Society (U.S.) and John M. Thompson. Washington, D.C. National Geographic Society.

警告：這些引文格式不一定是100％准確.