Cita APA

Azar, B. S. 1., & Hagen, S. A. 1. (2011). Fundamentals of english grammar: With answer key (4. edition.). White Plains, N.Y.: Pearson/Longman.

Citación estilo Chicago

Azar, Betty Schrampfer 1941-, y Stacy A. 1956- Hagen. Fundamentals of English Grammar: With Answer Key. 4. edition. White Plains, N.Y.: Pearson/Longman, 2011.

Cita MLA

Azar, Betty Schrampfer 1941-, y Stacy A. 1956- Hagen. Fundamentals of English Grammar: With Answer Key. 4. edition. White Plains, N.Y.: Pearson/Longman, 2011.