Pierce, D., & Douglas Pierce and Sean Kinsell. (2007). Cracking the TOEFL iBT. Tp. Hồ Chí Minh: Trẻ.
シカゴスタイル引用形Pierce, Douglas, , Douglas Pierce and Sean Kinsell. Cracking the TOEFL IBT. Tp. Hồ Chí Minh: Trẻ, 2007.
MLA引用形式Pierce, Douglas, , Douglas Pierce and Sean Kinsell. Cracking the TOEFL IBT. Tp. Hồ Chí Minh: Trẻ, 2007.
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