Gaya APA
Azar, B, S.
(1989).
Understanding And Using English Grammar Second Edition
(
Cet.2)
.
USA:
Prentice Hall.
Gaya MLA
Azar, Betty, Schrampfer.
"Understanding And Using English Grammar Second Edition".
Cet.2
USA:
Prentice Hall,
1989.
Text.