Cita APA

 Azar, B. S. (2017).  Understanding and using English grammar.  Pearson Education.

Chicago Style Citation

 Azar, Betty Schrampfer.  Understanding and Using English Grammar.  Pearson Education, 2017.

Cita MLA

 Azar, Betty Schrampfer.  Understanding and Using English Grammar.  Pearson Education, 2017.

Atenció: Aquestes cites poden no estar 100% correctes.