Gaya APA

dkk, S, L., Sudiyarto, O, , H. (2009). English For Academic Purpose : Essay Writing (Ed.1). Yogyakarta: Andi.

Gaya MLA

dkk, Susanto, Leo., Sudiyarto, Oktaviani, , Hastu. "English For Academic Purpose : Essay Writing". Ed.1 Yogyakarta: Andi, 2009. Text.