Gaya APA
Azar, B, S.
(1998).
Understanding and Using English Grammar :Third Edition
(
Ed. 3)
.
usa:
Pearson Longman.
Gaya MLA
Azar, Betty, Schrampfer.
"Understanding and Using English Grammar :Third Edition".
Ed. 3
usa:
Pearson Longman,
1998.
Book.