Gaya APA
Alam, .
(2010).
Economics 1B : for Senior high school Grade x semester 2
(
Cet.1)
.
JAKARTA:
Esis.
Gaya MLA
Alam, .
"Economics 1B : for Senior high school Grade x semester 2".
Cet.1
JAKARTA:
Esis,
2010.
Text.