Grammar and Usage
Allsop, J., & Woods, L. (1990). Making sense of idioms. London: Cassell.
Eastwood, J. (1999). Oxford practice grammar. Oxford: Oxford U. P.
Ferguson, R. (1992). English synonyms & antonyms. London: Penguin.
Hayakawa, S. I., & Ehrlich, E. (1996). Guide to synonyms and related words. London: Penguin.
Murphy, R., & Altman, R. (1989). Grammar in use. Reference and practice for intermediate students of English. Cambridge: Cambridge U. P.
Thomson, A. J., & Martinet, A. V. (1986). A practical English grammar. Oxford: Oxford U. P.
Dictionaries
English thesaurus. (1995). New Lanark: Brockhampton Press.
Gondar, M. T. (Ed.). (2002). Cambridge klett compact. Español/Inglés, English/Spanish. Cambridge: Cambridge U. P.
Jones, D., Roach, P., Hartman, J., & Setter, J. (Eds.). (2003). English pronouncing dictionary. Cambridge: Cambridge U. P.
Leech, G., Cook, V., Crombie, W., Ikegami, Y., Meara, P., O’Neill, R., Scholfied, P., & Togo, K. (1993). Longman language activator: The world’s first production dictionary. Essex: Longman Group UK Limited.
Pearsall, J. (Ed.). (2002). The concise Oxford English dictionary. Oxford: Oxford U. P.