Gaya APA
Asfandiyar, A, Y.
(1997).
Benda Alam Pun Berguna
.
Bandung:
Sams.
Gaya MLA
Asfandiyar, Andi, Yudha.
"Benda Alam Pun Berguna".
Bandung:
Sams,
1997.
Textbook.