Gaya APA

Azar, B, S., HARTLE, S. (2003). Fundamentals of english grammar:with answer key (3 rd.Ed). London: Longman Group.

Gaya MLA

Azar, Betty, Schrampfer., HARTLE, Shelley. "Fundamentals of english grammar:with answer key". 3 rd.Ed London: Longman Group, 2003. Text.