Gaya APA
Betsis, A. et al (2016).
Succeed In IELTS: Self-Practice, Authentic Test Format, Practical Usage .
Jakarta:
Erlangga.
Gaya MLA
Betsis, Andrew. et al.
"Succeed In IELTS: Self-Practice, Authentic Test Format, Practical Usage".
Jakarta:
Erlangga,
2016.
Text.