Gaya APA
RANGKUTI-HASIBUAN, S., ATASANA, T, N, [.
(1990).
English for specific purposes:
.
Jakarta:
Gramedia.
Gaya MLA
RANGKUTI-HASIBUAN, Sofia., ATASANA, Th., Nung, [ed.].
"English for specific purposes:".
Jakarta:
Gramedia,
1990.
Buku.