University of Cambridge. (2015). Cambridge English First 1: First certificate in English: with answers (1st ed., 3rd printing.). Cambridge, United Kingdom Cambridge: Cambridge University Press University of Cambridge Local Examinations Syndicate (UCLES).
Citación estilo ChicagoUniversity of Cambridge. Cambridge English First 1: First Certificate in English: With Answers. 1st ed., 3rd printing. Cambridge, United Kingdom Cambridge: Cambridge University Press University of Cambridge Local Examinations Syndicate (UCLES), 2015.
Cita MLAUniversity of Cambridge. Cambridge English First 1: First Certificate in English: With Answers. 1st ed., 3rd printing. Cambridge, United Kingdom Cambridge: Cambridge University Press University of Cambridge Local Examinations Syndicate (UCLES), 2015.