Gaya APA
Focus On Academic Skills for IELTS. (2004).
England:
Longman Group.
Gaya Chicago
Focus On Academic Skills for IELTS.
.
England:
Longman Group,
2004.
.
Gaya MLA
Focus On Academic Skills for IELTS.
.
England:
Longman Group,
2004.
.
Gaya Turabian
Focus On Academic Skills for IELTS.
England:
Longman Group,
2004.
.