Duckworth, M. (1998). Going international English for tourism: Workbook. American: Oxford University press.
Trích dẫn kiểu ChicagoDuckworth, Michael. Going International English for Tourism: Workbook. American: Oxford University press, 1998.
MLA citiranjeDuckworth, Michael. Going International English for Tourism: Workbook. American: Oxford University press, 1998.
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