Gaya APA

Azar, B, S., Hagen, S, A. (2006). Basic english grammar : with answer key. Ed. 3 (3). USA: Longman.

Gaya MLA

Azar, Betty, Schrampfer., Hagen, Stacy, A.. "Basic english grammar : with answer key. Ed. 3". 3 USA: Longman, 2006. Text.