APA (7th ed.) Citation

Cullen, P. (2007). Common mistakes at IELTS intermediate --and how to avoid them. Cambridge University Press.

Chicago Style (17th ed.) Citation

Cullen, Pauline. Common Mistakes at IELTS Intermediate --and How to Avoid Them. Cambridge New York: Cambridge University Press, 2007.

MLA (8th ed.) Citation

Cullen, Pauline. Common Mistakes at IELTS Intermediate --and How to Avoid Them. Cambridge University Press, 2007.