Gaya APA
Nurindrasari, D. (1989).
Understanding and using English grammer /Betty Schrampfer Azar (2nd.ed).
[S l. ::
Prentice hall regents.
Gaya MLA
Nurindrasari, Diana.
"Understanding and using English grammer /Betty Schrampfer Azar".
2nd.ed
[S l. ::
Prentice hall regents,
1989.
.