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Seon,Cho Young. (2010). Why : Kimia . Jakarta: Elex Media Kompotindo.

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Seon,Cho Young. Why : Kimia. Jakarta: Elex Media Kompotindo, 2010. Text.

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Seon,Cho Young. Why : Kimia. Jakarta: Elex Media Kompotindo, 2010. Text.

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Seon,Cho Young. Why : Kimia. Jakarta: Elex Media Kompotindo, 2010. Print.