Gaya APA
The official guide to the TOEFL iBT test. (2009).
Amerika:
ETS TOEFL.
Gaya Chicago
The official guide to the TOEFL iBT test.
.
Amerika:
ETS TOEFL,
2009.
Text.
Gaya MLA
The official guide to the TOEFL iBT test.
.
Amerika:
ETS TOEFL,
2009.
Text.
Gaya Turabian
The official guide to the TOEFL iBT test.
Amerika:
ETS TOEFL,
2009.
Print.