(2009). New toeic 4n4 (Four weeks for weakness): 520 level. Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh.
শিকাগো স্টাইলে সাইটেশনNew Toeic 4n4 (Four Weeks for Weakness): 520 Level. Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh, 2009.
এমএলএ সাইটেশনNew Toeic 4n4 (Four Weeks for Weakness): 520 Level. Thành phố Hồ Chí Minh: Tổng hợp Thành phố Hồ Chí Minh, 2009.
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