TY - BOOK TI - Cambridge English official IELTS 13 academic with answers: authentic examination papers SN - 9781108553094 (pbk.) AV - PE1128 .C178C PY - 2018/// CY - [Cambridge] PB - Cambridge University Press KW - International English Language Testing System KW - English language KW - Study and teaching KW - Examinations KW - IELTS ER -