(2012). Cambridge English: key 6 with answers: Official examination papers from university of cambridge. ESOL Examinations. New York: Cambridge University press.
Trích dẫn kiểu ChicagoCambridge English: Key 6 With Answers: Official Examination Papers From University of Cambridge. ESOL Examinations. New York: Cambridge University press, 2012.
Trích dẫn MLACambridge English: Key 6 With Answers: Official Examination Papers From University of Cambridge. ESOL Examinations. New York: Cambridge University press, 2012.
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