Gaya APA

AZAR, B, S., Hagen, S, A. (2009). Understanding And Using English Grammar (Ed. 4). New York: Pearson Longman.

Gaya MLA

AZAR, Betty, S.., Hagen, Stacy, A.. "Understanding And Using English Grammar". Ed. 4 New York: Pearson Longman, 2009. Text.