University of Cambridge. (2011). Cambridge preliminary English test 7 with answers: Examination papers from University of Cambridge ESOL examinations. Việt Nam: Fahasa Printing Factory.

University of Cambridge. Cambridge Preliminary English Test 7 With Answers: Examination Papers From University of Cambridge ESOL Examinations. Việt Nam: Fahasa Printing Factory, 2011.

University of Cambridge. Cambridge Preliminary English Test 7 With Answers: Examination Papers From University of Cambridge ESOL Examinations. Việt Nam: Fahasa Printing Factory, 2011.