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Riyanto, Slamet, Leila, Emilia. (2010). Essential of English vocabularies for fluent speaking . Yogyakarta: Pustaka Pelajar.

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Riyanto, Slamet, Leila, Emilia. Essential of English vocabularies for fluent speaking. Yogyakarta: Pustaka Pelajar, 2010. Text.

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Riyanto, Slamet, Leila, Emilia. Essential of English vocabularies for fluent speaking. Yogyakarta: Pustaka Pelajar, 2010. Text.

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Riyanto, Slamet, Leila, Emilia. Essential of English vocabularies for fluent speaking. Yogyakarta: Pustaka Pelajar, 2010. Print.