APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.