Gaya APA
The Official Guide to the New TOEFL. (2007).
New York:
McGraw-Hill.
Gaya Chicago
The Official Guide to the New TOEFL.
Second Edition.
New York:
McGraw-Hill,
2007.
.
Gaya MLA
The Official Guide to the New TOEFL.
Second Edition.
New York:
McGraw-Hill,
2007.
.
Gaya Turabian
The Official Guide to the New TOEFL.
New York:
McGraw-Hill,
2007.
.