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

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

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

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