APA引文

National Geographic Society (U.S.). (1959). National geographic. National Geographic Society.

Chicago Style (17th ed.) Citation

National Geographic Society (U.S.). National Geographic. Washington: National Geographic Society, 1959.

MLA引文

National Geographic Society (U.S.). National Geographic. National Geographic Society, 1959.

警告：這些引文格式不一定是100％准確.