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Kim, Gyun. (2010). Why ? Chemistry - Kimia (1). Jakarta: PT.Elex Media Komputindo.

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Kim, Gyun. Why ? Chemistry - Kimia. 1 Jakarta: PT.Elex Media Komputindo, 2010. Text.

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Kim, Gyun. Why ? Chemistry - Kimia. 1 Jakarta: PT.Elex Media Komputindo, 2010. Text.

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Kim, Gyun. Why ? Chemistry - Kimia. 1 Jakarta: PT.Elex Media Komputindo, 2010. Print.