Gaya APA
azar, B, S. (1989).
Understanding and using English grammar/Bety Schrampfer azar (Edisi 2 Jilid 1).
America:
Prentice Hall.
Gaya MLA
azar, Bety, Schrampfer.
"Understanding and using English grammar/Bety Schrampfer azar".
Edisi 2 Jilid 1
America:
Prentice Hall,
1989.
Text.