APA Style

Azar, B, S., Hagen, S, A. (2009). Understanding and Using English Grammar, 4th Ed. CD 1-2 (_). : Pearson Longman.

MLA Style

Azar, Betty, S.., Hagen, Stacy, A.. "Understanding and Using English Grammar, 4th Ed. CD 1-2". _ : Pearson Longman, 2009. Koleksi Multimedia / CD-ROM.