Gaya APA
Sharpe, P, J.
(2004).
Toefl iBT Internet-Based Test 2006-2007
.
United State of America:
Barrons.
Gaya MLA
Sharpe, Pamela, J..
"Toefl iBT Internet-Based Test 2006-2007".
United State of America:
Barrons,
2004.
Text.