Gaya APA

Rangkuti, D, H, S., Hasibuan, M. (1990). ENGLISH FOR SPECIFIC PURPOSES: AGRICULTURE . Jakarta: GRAMEDIA PUSTAKA UTAMA.

Gaya MLA

Rangkuti, Dra., H., Sofia., Hasibuan, MA. "ENGLISH FOR SPECIFIC PURPOSES: AGRICULTURE". Jakarta: GRAMEDIA PUSTAKA UTAMA, 1990. Text.