University of Cambridge. (2014). Cambridge key English test 7 with answers: Authentic examination papers from Cambridge English language assessment. Việt Nam: Fahasa Printing Factory.

University of Cambridge. Cambridge Key English Test 7 With Answers: Authentic Examination Papers From Cambridge English Language Assessment. Việt Nam: Fahasa Printing Factory, 2014.

University of Cambridge. Cambridge Key English Test 7 With Answers: Authentic Examination Papers From Cambridge English Language Assessment. Việt Nam: Fahasa Printing Factory, 2014.