Gaya APA
Official TOEFL iBT tests volume 1. (2015).
New York:
McGraw Hill.
Gaya Chicago
Official TOEFL iBT tests volume 1.
2nd. Ed..
New York:
McGraw Hill,
2015.
Text.
Gaya MLA
Official TOEFL iBT tests volume 1.
2nd. Ed..
New York:
McGraw Hill,
2015.
Text.
Gaya Turabian
Official TOEFL iBT tests volume 1.
New York:
McGraw Hill,
2015.
Print.