Citazione Stile APA (7a Edizione)

Azar, B. S. (1999). Understanding and using English grammar (3rd ed.). Prentice Hall Regents.

Citazione stile Chigago Style (17a edizione)

Azar, Betty Scrampfer. Understanding and Using English Grammar. 3rd ed. Upper Saddle River, N.J: Prentice Hall Regents, 1999.

Citatione MLA (9a ed.)

Azar, Betty Scrampfer. Understanding and Using English Grammar. 3rd ed. Prentice Hall Regents, 1999.