Gaya APA

Azar, B, S. (2002). Understanding and using : english grammar ed.3 with answer key (Sastra Inggris). : Prentice Hall.

Gaya MLA

Azar, Betty, Schrampfer. "Understanding and using : english grammar ed.3 with answer key". Sastra Inggris : Prentice Hall, 2002. .