APA Style
Hasibuan, Sofia. (1986).
English for Specific Purposes ECONOMICS .
Jakarta:
Gramedia.
Chicago Style
Hasibuan, Sofia.
English for Specific Purposes ECONOMICS.
Jakarta:
Gramedia,
1986.
Text.
MLA Style
Hasibuan, Sofia.
English for Specific Purposes ECONOMICS.
Jakarta:
Gramedia,
1986.
Text.
Turabian Style
Hasibuan, Sofia.
English for Specific Purposes ECONOMICS.
Jakarta:
Gramedia,
1986.
Print.