University of Cambridge ESOL Examinations. (2012). Cambridge English: Proficiency 1 with answers: authentic examination papers from Cambridge ESOL. Cambridge University Press.
Chicago-referens (17:e uppl.)University of Cambridge ESOL Examinations. Cambridge English: Proficiency 1 with Answers: Authentic Examination Papers from Cambridge ESOL. Cambridge: Cambridge University Press, 2012.
MLA-referens (8:e uppl.)University of Cambridge ESOL Examinations. Cambridge English: Proficiency 1 with Answers: Authentic Examination Papers from Cambridge ESOL. Cambridge University Press, 2012.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.