Gaya APA
Azar, B, S. (1989).
Understanding and using english grammar / Betty Schrampfer Azar (Ed. 2).
:
Prentice Hall Regents.
Gaya MLA
Azar, Betty, Schrampfer.
"Understanding and using english grammar / Betty Schrampfer Azar".
Ed. 2
:
Prentice Hall Regents,
1989.
Fak. Tarbiyah.