Azar, B. S. (1989). Understanding and using English grammar (2nd ed.). Prentice Hall Regents.
Chicago Style (17. basım) AtıfAzar, Betty Schrampfer. Understanding and Using English Grammar. 2nd ed. Englewood Cliffs, NJ: Prentice Hall Regents, 1989.
MLA (9th ed.) AtıfAzar, Betty Schrampfer. Understanding and Using English Grammar. 2nd ed. Prentice Hall Regents, 1989.
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