Gaya APA

Azar, B, S., Hagen, S, A. (2009). Pend. Bahasa Inggris. Understanding and using english grammar (fourth edition). USA: Pearson Longman.

Gaya MLA

Azar, Betty, Schrampfer., Hagen, Stacy, A.. "Pend. Bahasa Inggris. Understanding and using english grammar". fourth edition USA: Pearson Longman, 2009. Text.