Gaya APA

Azar, B, S., Hagen, S, A. (2011). Fundamentals Of Engglish Grammar Fourth Edition . America: Fearson Longman.

Gaya MLA

Azar, Betty, S., Hagen, Stacy, A.. "Fundamentals Of Engglish Grammar Fourth Edition". America: Fearson Longman, 2011. Text.