Gaya APA
Azar, B, S.
(1989).
Understanding and Using Engflish Grammar
(
ed. 2)
.
America:
Prentice Hall Regents.
Gaya MLA
Azar, Betty, Schrampfer.
"Understanding and Using Engflish Grammar".
ed. 2
America:
Prentice Hall Regents,
1989.
Text.