National Geographic Society (U.S.). (1888). The National geographic magazine. National Geographic Society.
芝加哥风格引文National Geographic Society (U.S.). The National Geographic Magazine. Washington: National Geographic Society, 1888.
MLA引文National Geographic Society (U.S.). The National Geographic Magazine. National Geographic Society, 1888.
警告：这些引文格式不一定是100％准确.