Gaya APA
Rangkuti-Hasibuan, Sofia. (1991).
English for specific purposes : economics .
Jakarta:
Gramedia.
Gaya Chicago
Rangkuti-Hasibuan, Sofia.
English for specific purposes : economics.
Jakarta:
Gramedia,
1991.
Text.
Gaya MLA
Rangkuti-Hasibuan, Sofia.
English for specific purposes : economics.
Jakarta:
Gramedia,
1991.
Text.
Gaya Turabian
Rangkuti-Hasibuan, Sofia.
English for specific purposes : economics.
Jakarta:
Gramedia,
1991.
Print.