Gaya APA

Azar, B, S. (1989). Understanding and using english grammar / Betty Schrampfer Azar . New Jersey: Prentice Hall Regent,.

Gaya MLA

Azar, Betty, Schrampfer. "Understanding and using english grammar / Betty Schrampfer Azar". New Jersey: Prentice Hall Regent,, 1989. Text.