Gaya APA

TOEFL IBT + CD. (2013). : Libraries Unlimited.

Gaya Chicago

TOEFL IBT + CD. . : Libraries Unlimited, 2013. Text.

Gaya MLA

TOEFL IBT + CD. . : Libraries Unlimited, 2013. Text.

Gaya Turabian

TOEFL IBT + CD. : Libraries Unlimited, 2013. Print.