Gaya APA
Step A Head 1. (2011).
Singapura:
Marshal Cavendish.
Gaya Chicago
Step A Head 1.
.
Singapura:
Marshal Cavendish,
2011.
Printed Book.
Gaya MLA
Step A Head 1.
.
Singapura:
Marshal Cavendish,
2011.
Printed Book.
Gaya Turabian
Step A Head 1.
Singapura:
Marshal Cavendish,
2011.
Printed Book.