University of Cambridge. (2012). Cambridge key English test 6 with answers: Official examination papers from University of Cambridge ESOL Examinations. Việt Nam: Fahasa Printing Factory.
Styl cytowania ChicagoUniversity of Cambridge. Cambridge Key English Test 6 With Answers: Official Examination Papers From University of Cambridge ESOL Examinations. Việt Nam: Fahasa Printing Factory, 2012.
Styl cytowania MLAUniversity of Cambridge. Cambridge Key English Test 6 With Answers: Official Examination Papers From University of Cambridge ESOL Examinations. Việt Nam: Fahasa Printing Factory, 2012.
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