Gaya APA
HASIBUAN, H, S, R.
(1990).
ENGLISH FOR SPECIFIC PURPOSES : AGRICULTURE
.
JAKARTA:
PT. GRAMEDIA.
Gaya MLA
HASIBUAN, H., SOFIA, RANGKUTI.
"ENGLISH FOR SPECIFIC PURPOSES : AGRICULTURE".
JAKARTA:
PT. GRAMEDIA,
1990.
Prodi S1 Sastra Inggris.