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Andrew, V. C.. (2010). Ruby (Cet. 1.--). Jakarta: Dastan books.

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Andrew, V. C.. Ruby. Cet. 1.-- Jakarta: Dastan books, 2010. Text.

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Andrew, V. C.. Ruby. Cet. 1.-- Jakarta: Dastan books, 2010. Text.

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Andrew, V. C.. Ruby. Cet. 1.-- Jakarta: Dastan books, 2010. Print.