Ackert, P., & Partricia Ackert; Đặng Tuấn Anh. (1996). Concepts and comments. Tp. Hồ Chí Minh: Trẻ.
Παραπομπή Chicago StyleAckert, Partricia, και Partricia Ackert; Đặng Tuấn Anh. Concepts and Comments. Tp. Hồ Chí Minh: Trẻ, 1996.
Παραπομπή MLAAckert, Partricia, και Partricia Ackert; Đặng Tuấn Anh. Concepts and Comments. Tp. Hồ Chí Minh: Trẻ, 1996.
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