Cita APA

Azar, B. S. 1., & Hagen, S. A. 1. (2009). Understanding and using English grammar (4. [international] edition.). White Plains, N.Y.: Pearson/Longman.

Citación estilo Chicago

Azar, Betty Schrampfer 1941-, y Stacy A. 1956- Hagen. Understanding and Using English Grammar. 4. [international] edition. White Plains, N.Y.: Pearson/Longman, 2009.

Cita MLA

Azar, Betty Schrampfer 1941-, y Stacy A. 1956- Hagen. Understanding and Using English Grammar. 4. [international] edition. White Plains, N.Y.: Pearson/Longman, 2009.