Richards, J. C. Interchange. English for international communication. Student´s book 1 (20a ed.).
芝加哥风格引文Richards, Jack C. Interchange. English for International Communication. Student´s Book 1. 20a ed.
MLA引文Richards, Jack C. Interchange. English for International Communication. Student´s Book 1. 20a ed.
警告：这些引文格式不一定是100％准确.