Gaya APA
HASIBUAN, Sofia Rangkuti. (1991).
ENGLISH FOR SPECIFIC PURPOSES; ECONOMICS .
:
.
Gaya Chicago
HASIBUAN, Sofia Rangkuti.
ENGLISH FOR SPECIFIC PURPOSES; ECONOMICS.
:
,
1991.
Text.
Gaya MLA
HASIBUAN, Sofia Rangkuti.
ENGLISH FOR SPECIFIC PURPOSES; ECONOMICS.
:
,
1991.
Text.
Gaya Turabian
HASIBUAN, Sofia Rangkuti.
ENGLISH FOR SPECIFIC PURPOSES; ECONOMICS.
:
,
1991.
Print.