Do you also need an online dictionary? I recommend these to you.

http://www.wordreference.com/definicion/
(free)

Diccionarios bilingües:

Diccionario Oxford Study para estudiantes de inglés. OUP

Cambridge Klett Compact. Inglés-Español/ Spanish-English. CUP

Richmond Compact Dictionary. Español-Inglés/ English-Spanish. Richmond

Diccionarios monolingües:

Oxford Wordpower Dictionary for learners of English. OUP.

Longman Wordwise Dictionary+CD-ROM. Longman

MacMillan Essential Dictionary for Learners of English + CD-ROM. MacMillan 2003

Gramáticas:

Murphy, R.: English Grammar in Use. CUP. Third Edition. CD-Rom included

Bolton, D. & Goodey, D.: English Grammar in Steps. Richmond

Fuchs, M. & Bonner, M.: Grammar Express. Pearson Education Ltd. 2003

Vince, M.: Intermediate Language Practice. MacMillan Heinemann

Sellen, Derek: Grammar World. Black Cat Publishing. 2000

Eastwood, John: Oxford Practice Grammar. Intermediate.+CD-ROM. OUP 2006

Pronunciación:

Cunningham, S. & Moor, P.: New Headway Pronunciation Course. Intermediate. OUP

Hancock, Mark: English Pronunciation in Use. Intermediate. CUP

Vocabulario:

Redman, S.: English Vocabulary in Use. Pre-intermediate & intermediate. CUP

Thomas, B.J.: Intermediate Vocabulary. Longman