Azar, B. S. (2003). Fundamentals of english grammar: With answer key (3rd ed.). Longman.
Cita Chicago (17th ed.)Azar, Betty Schrampfer. Fundamentals of English Grammar: With Answer Key. 3rd ed. White Plains: Longman, 2003.
Cita MLA (9th ed.)Azar, Betty Schrampfer. Fundamentals of English Grammar: With Answer Key. 3rd ed. Longman, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.