APA citiranje

(2006).  Focus on grammar 4. An integrated skills approach.  Pearson Longman.

Trích dẫn kiểu Chicago

 Focus On Grammar 4. An Integrated Skills Approach.  Pearson Longman, 2006.

MLA citiranje

 Focus On Grammar 4. An Integrated Skills Approach.  Pearson Longman, 2006.

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