ENGLISH GRAMMAR IN USE INTERMEDIATE BOOK WITH ANSWERS (5ª ED.) (5ª). Autor/es: Murphy, Raymond; Editorial: CAMBRIDGE UNIVERSITY PRESS; ISBN(13): 9781108457651
ENGLISH VOCABULARY IN USE (4TH EDITION) UPPER INTERMEDIATE BOOK WITH ANSWERS (4ª). Autor/es: Michael Mccarthy; Editorial: CAMBRIDGE UNIVERSITY PRESS; ISBN(13): 9781316631751
OXFORD PRACTICE GRAMMAR INTERMEDIATE WITH ANSWERS. Revised Edition: The right balance of English grammar explanation and practice for your language level; Autor/es: Eastwood, John; Editorial: OXFORD UNIVERSITY PRESS; ISBN(13): 9780194214742