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Prastowo, Panca, Yulianto, Diyan. (2010). Improve your TOEFL vocabulary in seconds . Yogyakarta: Diva Press.

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Prastowo, Panca, Yulianto, Diyan. Improve your TOEFL vocabulary in seconds. Yogyakarta: Diva Press, 2010. Text.

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Prastowo, Panca, Yulianto, Diyan. Improve your TOEFL vocabulary in seconds. Yogyakarta: Diva Press, 2010. Text.

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Prastowo, Panca, Yulianto, Diyan. Improve your TOEFL vocabulary in seconds. Yogyakarta: Diva Press, 2010. Print.