APA引文

National Geographic Society (U.S.). (1991). National Geographic picture atlas of our world. The National Geographic Society.

芝加哥风格引文

National Geographic Society (U.S.). National Geographic Picture Atlas of Our World. Washington D.C: The National Geographic Society, 1991.

MLA引文

National Geographic Society (U.S.). National Geographic Picture Atlas of Our World. The National Geographic Society, 1991.

警告：这些引文格式不一定是100％准确.