Oxford English Dictionary

Longman Dictionary of Contemporary English, 6e (Paper)

Longman Idioms Dictionary

Oxford Collocations Dictionary for Students of English. Second edition. Pack (Book and CD-ROM)

Longman Dictionary of Common Errors

Longman Dictionary of Contemporary English

Longman Pocket Activator

Oxford Advanced Learner´s Dictionary, 9th ed.

Oxford Idioms Dictionary for learners of English 2nd Revised edition

Longman Advanced Learners´ Grammar + Key

Longman Pocket English Dictionary

Oxford Large Print Thesaurus

Cambridge Idioms Dictionary 2nd ed.

Longman Pronunciation Dictionary. New Edition