Gaya APA
Step Ahead 2. (2011).
Singapura:
Marshal Cavendish.
Gaya Chicago
Step Ahead 2.
.
Singapura:
Marshal Cavendish,
2011.
Printed Book.
Gaya MLA
Step Ahead 2.
.
Singapura:
Marshal Cavendish,
2011.
Printed Book.
Gaya Turabian
Step Ahead 2.
Singapura:
Marshal Cavendish,
2011.
Printed Book.