Ackert, P. (2003). Cause and effect: Intermediate reading practice with answers. Trẻ.
シカゴスタイル引用形Ackert, Patricia. Cause and Effect: Intermediate Reading Practice With Answers. Trẻ, 2003.
MLA引用形式Ackert, Patricia. Cause and Effect: Intermediate Reading Practice With Answers. Trẻ, 2003.
警告: この引用は必ずしも正確ではありません.