Gaya APA
Azar, B, S.
(1989).
UNDERSTANDING AND USING ENGLISH GRAMMAR
(
Edisi 2)
.
:
Prentice Hall.
Gaya MLA
Azar, Betty, Schrampfer.
"UNDERSTANDING AND USING ENGLISH GRAMMAR".
Edisi 2
:
Prentice Hall,
1989.
Bahasa.