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Drs. Akh Kardimin, M.Hum. (2012). Essential English Grammar (1). Yogyakarta: Pustaka Pelajar.

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Drs. Akh Kardimin, M.Hum. Essential English Grammar. 1 Yogyakarta: Pustaka Pelajar, 2012. Text.

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Drs. Akh Kardimin, M.Hum. Essential English Grammar. 1 Yogyakarta: Pustaka Pelajar, 2012. Text.

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Drs. Akh Kardimin, M.Hum. Essential English Grammar. 1 Yogyakarta: Pustaka Pelajar, 2012. Print.