Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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