Gaya APA

Azar, B, S. (1989). Understanding And Using English Grammar 2nd Ed (2nd Ed). Englewood Cliffs: Prentice Hall Regents.

Gaya MLA

Azar, Betty, Schrampfer. "Understanding And Using English Grammar 2nd Ed". 2nd Ed Englewood Cliffs: Prentice Hall Regents, 1989. Text.