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Gaya APA

Purwanto, J, S, D, Y. (2013). English for Academic Purposes . Yogyakarta: Yogyakarta: ANDI.

Gaya MLA

Purwanto, Jonathan, Sarwono, Dan, Yudhy. "English for Academic Purposes". Yogyakarta: Yogyakarta: ANDI, 2013. Text.