APA Style
National Geographic Jan 09-Mei 09. (2009).
Jakarta:
PT GRAMEDIA.
Chicago Style
National Geographic Jan 09-Mei 09.
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Jakarta:
PT GRAMEDIA,
2009.
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MLA Style
National Geographic Jan 09-Mei 09.
.
Jakarta:
PT GRAMEDIA,
2009.
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Turabian Style
National Geographic Jan 09-Mei 09.
Jakarta:
PT GRAMEDIA,
2009.
.