DREWS, D. A. e. a. (1979). Tandem: Language in action series skills reinforcement (teacher's edition). National Textbook.
芝加哥风格引文DREWS, Donna Anthony et all. Tandem: Language in Action Series Skills Reinforcement (teacher's Edition). Skokie: National Textbook, 1979.
MLA引文DREWS, Donna Anthony et all. Tandem: Language in Action Series Skills Reinforcement (teacher's Edition). National Textbook, 1979.
警告：这些引文格式不一定是100％准确.