University of Cambridge. (2005). Cambridge IELTS 6 with answers: Examination papers from University of Cambridge ESOL examinations: English for Speakers of Other Languages. New York: Cambridge university Press.

University of Cambridge. Cambridge IELTS 6 With Answers: Examination Papers From University of Cambridge ESOL Examinations: English for Speakers of Other Languages. New York: Cambridge university Press, 2005.

University of Cambridge. Cambridge IELTS 6 With Answers: Examination Papers From University of Cambridge ESOL Examinations: English for Speakers of Other Languages. New York: Cambridge university Press, 2005.