David Cotton. (2006). Market leader: Upper intermediate business english course book (New edition.). England: Pearson Longman.
Trích dẫn kiểu ChicagoDavid Cotton. Market Leader: Upper Intermediate Business English Course Book. New edition. England: Pearson Longman, 2006.
Deismireacht MLADavid Cotton. Market Leader: Upper Intermediate Business English Course Book. New edition. England: Pearson Longman, 2006.
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