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Widjaja,Grace. (2006). Certain important english conversation / Grace Widjaja . Jakarta: Gramedia.

Gaya Chicago

Widjaja,Grace. Certain important english conversation / Grace Widjaja. Jakarta: Gramedia, 2006. Text.

Gaya MLA

Widjaja,Grace. Certain important english conversation / Grace Widjaja. Jakarta: Gramedia, 2006. Text.

Gaya Turabian

Widjaja,Grace. Certain important english conversation / Grace Widjaja. Jakarta: Gramedia, 2006. Print.