Gaya APA
Hasibuan, Sofia. (1986).
English for Specific Purpose: Economics .
Jakarta:
GRAMEDIA.
Gaya Chicago
Hasibuan, Sofia.
English for Specific Purpose: Economics .
Jakarta:
GRAMEDIA,
1986.
UMUM.
Gaya MLA
Hasibuan, Sofia.
English for Specific Purpose: Economics .
Jakarta:
GRAMEDIA,
1986.
UMUM.
Gaya Turabian
Hasibuan, Sofia.
English for Specific Purpose: Economics .
Jakarta:
GRAMEDIA,
1986.
UMUM.