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APA-viiteUniversity of Cambridge. ESOL Examinations, IELTS Australia, & British Council. (2010). Official IELTS practice materials (Updated March 2009 [ed.].). University of Cambridge, ESOL Examinations.
Chicago-tyylinen lähdeviittausUniversity of Cambridge. ESOL Examinations, IELTS Australia, ja British Council. Official IELTS Practice Materials. Updated March 2009 [ed.]. Cambridge, UK: University of Cambridge, ESOL Examinations, 2010.
MLA-viiteUniversity of Cambridge. ESOL Examinations, et al. Official IELTS Practice Materials. Updated March 2009 [ed.]. University of Cambridge, ESOL Examinations, 2010.
Harvard-tyylinen lähdeviittausUniversity of Cambridge. ESOL Examinations, IELTS Australia & British Council. 2010. Official IELTS practice materials. Updated March 2009 [ed.]. Cambridge, UK: University of Cambridge, ESOL Examinations.