Cita APA (7a ed.)

(2012). Cambridge English: Proficiency 1 with answers. Authentic examination papers from Cambridge ESOL. Cambridge, Cambridge University Press, 2012.

Cita Chicago Style (17a ed.)

Cambridge English: Proficiency 1 with Answers. Authentic Examination Papers from Cambridge ESOL. Cambridge, Cambridge University Press, 2012, 2012.

Cita MLA (9a ed.)

Cambridge English: Proficiency 1 with Answers. Authentic Examination Papers from Cambridge ESOL. Cambridge, Cambridge University Press, 2012, 2012.