Koo, J. (2011). New TOEIC: Speaking coach (Answer key). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh.
শিকাগো স্টাইলে সাইটেশনKoo, Jay. New TOEIC: Speaking Coach (Answer Key). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh, 2011.
এমএলএ সাইটেশনKoo, Jay. New TOEIC: Speaking Coach (Answer Key). Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh, 2011.
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