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.
Trích dẫn MLADavid Cotton. Market Leader: Upper Intermediate Business English Course Book. New edition. England: Pearson Longman, 2006.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.