Ackert, P., & Partricia Ackert; Đặng Tuấn Anh. (1997). Cause & effect: Intermediate reading practice. Tp. Hồ Chí Minh: Trẻ.
Styl ChicagoAckert, Partricia, a Partricia Ackert; Đặng Tuấn Anh. Cause & Effect: Intermediate Reading Practice. Tp. Hồ Chí Minh: Trẻ, 1997.
Citace podle MLAAckert, Partricia, a Partricia Ackert; Đặng Tuấn Anh. Cause & Effect: Intermediate Reading Practice. Tp. Hồ Chí Minh: Trẻ, 1997.
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