APA
Azar B. S., . (1989). Understanding and using english grammar. Englewood Cliffs: Prentice Hall.
Chicago
Azar Betty Schrampfer, . 1989. Understanding and using english grammar. Englewood Cliffs: Prentice Hall.
Harvard
Azar B. S., . (1989). Understanding and using english grammar. Englewood Cliffs: Prentice Hall.
MLA
Azar Betty Schrampfer, . Understanding and using english grammar. Englewood Cliffs: Prentice Hall. 1989.