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Kim, Min-Jae. (2009). Why? Invention and Discovery . jakarta: PT Elex Media Komputindo.

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Kim, Min-Jae. Why? Invention and Discovery. jakarta: PT Elex Media Komputindo, 2009. Text.

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Kim, Min-Jae. Why? Invention and Discovery. jakarta: PT Elex Media Komputindo, 2009. Text.

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Kim, Min-Jae. Why? Invention and Discovery. jakarta: PT Elex Media Komputindo, 2009. Print.