APA Style
National Geographic : Vol. 222 No. 1 - 6 Jun - Dec 2012. (0).
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Chicago Style
National Geographic : Vol. 222 No. 1 - 6 Jun - Dec 2012.
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MLA Style
National Geographic : Vol. 222 No. 1 - 6 Jun - Dec 2012.
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Turabian Style
National Geographic : Vol. 222 No. 1 - 6 Jun - Dec 2012.
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Bound Journal.