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Gaya APA

Prasetya, H. (2009). Business Letters : Surat-Surat Bisnis (Cet. 1). Jakarta: Pustaka Grhatama.

Gaya MLA

Prasetya, Hendrawan. "Business Letters : Surat-Surat Bisnis". Cet. 1 Jakarta: Pustaka Grhatama, 2009. Text.