University of Cambridge. Local Examinations Syndicate. (2005). Cambridge IELTS 4: Examination papers from the University of Cambridge ESOL Examinations (With answers.). Cambridge University Press.
Citação do estilo Chicago (17ª ed.)University of Cambridge. Local Examinations Syndicate. Cambridge IELTS 4: Examination Papers from the University of Cambridge ESOL Examinations. With answers. Cambridge: Cambridge University Press, 2005.
Citação MLA (8ª ed.)University of Cambridge. Local Examinations Syndicate. Cambridge IELTS 4: Examination Papers from the University of Cambridge ESOL Examinations. With answers. Cambridge University Press, 2005.
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