Advanced Learner's English Dictionary (Collins Cobuild) with CD-ROM
LDOCE (4E/UP) W/WRITING ASSIST : PAPER+ROM(2) QT7 (Longman Dictionary of Contemporary English)
Oxford Advanced Learner's Dictionary
Practical English Usage (Practical English Usage, Third Edition)
Oxford Collocations Dictionary for Students of English
Oxford Phrasal Verbs Dictionary: For Learners of English (Elt)
LONGMAN AMERICAN IDIOMS DICTIONARY