Gaya APA
azar, B, S.
(1999).
Understanding and Using English Grammar 3 rd Edition
(
Edisi 3)
.
:
pearson education.
Gaya MLA
azar, Betty, Schrampfer.
"Understanding and Using English Grammar 3 rd Edition".
Edisi 3
:
pearson education,
1999.
Textbook.