Gaya APA
Step Ahead 2 : Activity Book. (2010).
Singapura:
Panpac Education.
Gaya Chicago
Step Ahead 2 : Activity Book.
.
Singapura:
Panpac Education,
2010.
Printed Book.
Gaya MLA
Step Ahead 2 : Activity Book.
.
Singapura:
Panpac Education,
2010.
Printed Book.
Gaya Turabian
Step Ahead 2 : Activity Book.
Singapura:
Panpac Education,
2010.
Printed Book.