Gaya APA
SITUMORANG, A.
(2010).
ECONOMICS 1B FOR SENIOR HIGH SCHOOL GRADE X SEMESTER 1
.
JAKARTA:
ERLANGGA.
Gaya MLA
SITUMORANG, ALAM.
"ECONOMICS 1B FOR SENIOR HIGH SCHOOL GRADE X SEMESTER 1".
JAKARTA:
ERLANGGA,
2010.
Text.