Gaya APA
HASIBUAN, Sofia R.. (1991).
English for specific purposes economics .
Jakarta:
GM Pust. Utama.
Gaya Chicago
HASIBUAN, Sofia R..
English for specific purposes economics.
Jakarta:
GM Pust. Utama,
1991.
Text.
Gaya MLA
HASIBUAN, Sofia R..
English for specific purposes economics.
Jakarta:
GM Pust. Utama,
1991.
Text.
Gaya Turabian
HASIBUAN, Sofia R..
English for specific purposes economics.
Jakarta:
GM Pust. Utama,
1991.
Print.