Παραπομπή σε μορφή APA (7η εκδ.)

(2005). Cambridge Certificate of proficiency in English 4: With answers : examination papers from University of Cambridge ESOL examinations : English for speakers of other language. Cambridge University Press.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Cambridge Certificate of Proficiency in English 4: With Answers : Examination Papers from University of Cambridge ESOL Examinations : English for Speakers of Other Language. Cambridge: Cambridge University Press, 2005.

Παραπομπή σε μορφή MLA (9th εκδ.)

Cambridge Certificate of Proficiency in English 4: With Answers : Examination Papers from University of Cambridge ESOL Examinations : English for Speakers of Other Language. Cambridge University Press, 2005.