APA Style

Hagen, S, A., Azar, B, S. (2009). Understanding and Using English Grammar, 4th Ed. With Answer Key, CD1-2 Chapters 1-20 (4th. Edition). America: Pearson Logman.

MLA Style

Hagen, Stacy, A.., Azar, Betty, S. "Understanding and Using English Grammar, 4th Ed. With Answer Key, CD1-2 Chapters 1-20". 4th. Edition America: Pearson Logman, 2009. Koleksi Multimedia / CD-ROM.