Gaya APA
Pratiwi, A.
(2011).
Fenomena Alam paling Spektakuler
.
Yogyakarta:
Jogja Great Publisher.
Gaya MLA
Pratiwi, Astri.
"Fenomena Alam paling Spektakuler".
Yogyakarta:
Jogja Great Publisher,
2011.
Book.