Gaya APA
Essential Grammar in Use With Answer. (1997).
USA:
Cambridge University Press.
Gaya Chicago
Essential Grammar in Use With Answer.
ed.2.
USA:
Cambridge University Press,
1997.
.
Gaya MLA
Essential Grammar in Use With Answer.
ed.2.
USA:
Cambridge University Press,
1997.
.
Gaya Turabian
Essential Grammar in Use With Answer.
USA:
Cambridge University Press,
1997.
.