National Geographic Society. (2004). Africa (1a. ed.). National Geographic Society.
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Chicago Style (17th ed.) Citation
National Geographic Society. Africa. 1a. ed. Buenos Aires: National Geographic Society, 2004.
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MLA引文
National Geographic Society. Africa. 1a. ed. National Geographic Society, 2004.
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警告：這些引文格式不一定是100％准確.