University of Cambridge ESOL Examinations. (2012). Cambridge English: Proficiency 1 with answers: authentic examination papers from Cambridge ESOL. Cambridge University Press.
Style de citation Chicago (17e éd.)University of Cambridge ESOL Examinations. Cambridge English: Proficiency 1 with Answers: Authentic Examination Papers from Cambridge ESOL. Cambridge: Cambridge University Press, 2012.
Style de citation MLA (8e éd.)University of Cambridge ESOL Examinations. Cambridge English: Proficiency 1 with Answers: Authentic Examination Papers from Cambridge ESOL. Cambridge University Press, 2012.
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