Gaya APA
Azar, B, S. (1989).
Understanding and using English grammar (Ed. 2).
Eaglewood Cliffs, New Jersey:
Prentice Hall.
Gaya MLA
Azar, Betty, Schramfer.
"Understanding and using English grammar".
Ed. 2
Eaglewood Cliffs, New Jersey:
Prentice Hall,
1989.
Text.