Gaya APA

Sharpe, P, J. (2016). Barron's : Toefl IBT ; Internet-Based Test (15th.Ed). New York: Barron's Educational Series, Inc.

Gaya MLA

Sharpe, Pamela, J.. "Barron's : Toefl IBT ; Internet-Based Test". 15th.Ed New York: Barron's Educational Series, Inc, 2016. Text.