APA Style

Azar, Betty Schrampfer, Hagen, Stacy A.. (2009). Understanding and Using English Grammar Fourth Edition With Answer Key (Ed. 4). USA: Pearson Longman.

Chicago Style

Azar, Betty Schrampfer, Hagen, Stacy A.. Understanding and Using English Grammar Fourth Edition With Answer Key. Ed. 4 USA: Pearson Longman, 2009. Text.

MLA Style

Azar, Betty Schrampfer, Hagen, Stacy A.. Understanding and Using English Grammar Fourth Edition With Answer Key. Ed. 4 USA: Pearson Longman, 2009. Text.

Turabian Style

Azar, Betty Schrampfer, Hagen, Stacy A.. Understanding and Using English Grammar Fourth Edition With Answer Key. Ed. 4 USA: Pearson Longman, 2009. Print.