Citazione Stile APA (7a Edizione)

Azar, B. S. (2002). Understanding and using english grammar (3rd ed.). Pearson Education.

Citazione stile Chigago Style (17a edizione)

Azar, Betty Schrampfer. Understanding and Using English Grammar. 3rd ed. New York: Pearson Education, 2002.

Citatione MLA (9a ed.)

Azar, Betty Schrampfer. Understanding and Using English Grammar. 3rd ed. Pearson Education, 2002.