Gaya APA
AZAR, B, S. (1989).
Understanding and using english grammar (2nd.ed.).
Englewood Cliffs:
Prentice Hall Regents.
Gaya MLA
AZAR, Betty, Schrampfer.
"Understanding and using english grammar".
2nd.ed.
Englewood Cliffs:
Prentice Hall Regents,
1989.
Buku.