APA Style
Hasibuan, Sofia. (1986).
English For Specific Purposes Economics .
:
.
Chicago Style
Hasibuan, Sofia.
English For Specific Purposes Economics.
:
,
1986.
Text.
MLA Style
Hasibuan, Sofia.
English For Specific Purposes Economics.
:
,
1986.
Text.
Turabian Style
Hasibuan, Sofia.
English For Specific Purposes Economics.
:
,
1986.
Print.