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Cho, Young-Seon. (2010). Why? Chemistry : Kimia . Jakarta: Elex Media Komputindo.

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Cho, Young-Seon. Why? Chemistry : Kimia. Jakarta: Elex Media Komputindo, 2010. Text.

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Cho, Young-Seon. Why? Chemistry : Kimia. Jakarta: Elex Media Komputindo, 2010. Text.

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Cho, Young-Seon. Why? Chemistry : Kimia. Jakarta: Elex Media Komputindo, 2010. Print.