Hartwell Fiske, Robert. The Dictionary of Concise Writing: 10,000 Alternatives to Wordy Phrases. Oak Park, Illinois: Mario Street Press, 2002.
Cutts, Martin. Plain English Lexicon: A guide to whether your words will be understood. Second Edition, 2011. Download from the Plain Language Commission at http://www.clearest.co.uk/pages/publications/plainenglishlexicon
Plain English definitions for hundreds of phrases used in the public and voluntary sectors.
A multilingual database of legal terms, sponsored by the Law Foundation of British Columbia.