APA সাইটেশন

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

শিকাগো স্টাইলে সাইটেশন

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

এমএলএ সাইটেশন

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