Gaya APA
Azar, B, S. (1999).
Understanding and Using English Grammar, 3rd Edition (3).
United States of America:
Pearson Longman.
Gaya MLA
Azar, Betty, Schrampfer.
"Understanding and Using English Grammar, 3rd Edition".
3
United States of America:
Pearson Longman,
1999.
.