Gaya APA
Azar, Betty Schrampfer. (1989).
Understanding and using english grammar (Ed 2).
Medan:
Pretice Hall.
Gaya Chicago
Azar, Betty Schrampfer.
Understanding and using english grammar.
Ed 2
Medan:
Pretice Hall,
1989.
SASTRA.
Gaya MLA
Azar, Betty Schrampfer.
Understanding and using english grammar.
Ed 2
Medan:
Pretice Hall,
1989.
SASTRA.
Gaya Turabian
Azar, Betty Schrampfer.
Understanding and using english grammar.
Ed 2
Medan:
Pretice Hall,
1989.
SASTRA.