Gaya APA
The Official guide to the new TOEFL ibt. (2006).
New York:
McGraw Hill.
Gaya Chicago
The Official guide to the new TOEFL ibt.
.
New York:
McGraw Hill,
2006.
CD ROM.
Gaya MLA
The Official guide to the new TOEFL ibt.
.
New York:
McGraw Hill,
2006.
CD ROM.
Gaya Turabian
The Official guide to the new TOEFL ibt.
New York:
McGraw Hill,
2006.
CD ROM.