APA (7th ed.) Citation

CAMBRIDGE. (2013). IELTS9. Cambridge university press.

Chicago Style (17th ed.) Citation

CAMBRIDGE. IELTS9. UNITED KINGDOM: Cambridge university press, 2013.

MLA (9th ed.) Citation

CAMBRIDGE. IELTS9. Cambridge university press, 2013.

Warning: These citations may not always be 100% accurate.