Hahn, R. (2011). A1 TOEFL iBT: Speaking. TP. HCM: Trẻ.
Trích dẫn kiểu ChicagoHahn, Richie. A1 TOEFL IBT: Speaking. TP. HCM: Trẻ, 2011.
Deismireacht MLAHahn, Richie. A1 TOEFL IBT: Speaking. TP. HCM: Trẻ, 2011.
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