(2012). Cambridge English: key 6 with answers: Official examination papers from university of cambridge. ESOL Examinations. New York: Cambridge University press.
Παραπομπή Chicago StyleCambridge English: Key 6 With Answers: Official Examination Papers From University of Cambridge. ESOL Examinations. New York: Cambridge University press, 2012.
Παραπομπή MLACambridge English: Key 6 With Answers: Official Examination Papers From University of Cambridge. ESOL Examinations. New York: Cambridge University press, 2012.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.