Diccionarios monolingües:

The Concise Oxford Dictionary. Oxford: Oxford University Press, 1999.

Oxford Advanced Learner's Dictionary. Oxford: Oxford University Press, 1998.

Cambridge International Dictionary of English. Cambridge: Cambridge University Press.

Language Activator: Longman.

Gramáticas:

Oxford Practice Grammar. J. Eastwood & R. Mackin. Oxford: Oxford University Press.

A Practical English Grammar. A.J. Thomson & A.V. Martinet.

English Grammar in Use. R. Murphy. Cambridge: Cambridge University Press.

Co-Build English Guides. Collins, 1996.