Gaya APA
RITONGA, Abdul Racman. (1997).
ALAM SEMESTA .
:
.
Gaya Chicago
RITONGA, Abdul Racman.
ALAM SEMESTA.
:
,
1997.
Text.
Gaya MLA
RITONGA, Abdul Racman.
ALAM SEMESTA.
:
,
1997.
Text.
Gaya Turabian
RITONGA, Abdul Racman.
ALAM SEMESTA.
:
,
1997.
Print.