Gaya APA
The Official Guide TOEFL Test. (2012).
Singapura:
McGraw Hill Education.
Gaya Chicago
The Official Guide TOEFL Test.
Fourth edition.
Singapura:
McGraw Hill Education,
2012.
Printed Book.
Gaya MLA
The Official Guide TOEFL Test.
Fourth edition.
Singapura:
McGraw Hill Education,
2012.
Printed Book.
Gaya Turabian
The Official Guide TOEFL Test.
Singapura:
McGraw Hill Education,
2012.
Printed Book.