Gaya APA
RANGKUTI-HASIBUAN, Sofia, Hajjah. (1998).
English serial 1: economics .
JAKARTA:
Djambatan.
Gaya Chicago
RANGKUTI-HASIBUAN, Sofia, Hajjah.
English serial 1: economics.
JAKARTA:
Djambatan,
1998.
Text.
Gaya MLA
RANGKUTI-HASIBUAN, Sofia, Hajjah.
English serial 1: economics.
JAKARTA:
Djambatan,
1998.
Text.
Gaya Turabian
RANGKUTI-HASIBUAN, Sofia, Hajjah.
English serial 1: economics.
JAKARTA:
Djambatan,
1998.
Print.