(2012). Cambridge English: key 6 with answers: Official examination papers from university of cambridge. ESOL Examinations. New York: Cambridge University press.
Chicago-стиль цитированияCambridge English: Key 6 With Answers: Official Examination Papers From University of Cambridge. ESOL Examinations. New York: Cambridge University press, 2012.
MLA-цитированиеCambridge English: Key 6 With Answers: Official Examination Papers From University of Cambridge. ESOL Examinations. New York: Cambridge University press, 2012.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.