Duckworth, M. (1992). First Class: English for Tourism : Workbook. Hong Kong: Oxford University.
Trích dẫn kiểu ChicagoDuckworth, Michael. First Class: English for Tourism : Workbook. Hong Kong: Oxford University, 1992.
MLA引文Duckworth, Michael. First Class: English for Tourism : Workbook. Hong Kong: Oxford University, 1992.
警告:这些引文格式不一定是100%准确.