APA Style

Azar, B, S., Hagen, S, A. (2009). Understanding and using English grammar. Fourth International Edition (Fourth International Edition). White Plains: Pearson Longman.

MLA Style

Azar, Betty, Schrampfer., Hagen, Stacy, A.. "Understanding and using English grammar. Fourth International Edition". Fourth International Edition White Plains: Pearson Longman, 2009. Text.