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2. The American Heritage Dictionary of the English Language, 4th ed. (2000), Houghton Mifflin, New York, NY.
3. The American Heritage Student Dictionary (1998), Houghton Mifflin, New York, NY.
4. Association of Research Libraries (1998), “ARL statistics Q&A”, ARL, Washington, DC, 31 August, available: http://www.arl.org/stats/arlstat/arlstatqa.html
5. Hales, D. (2000), “E‐cars take to the road”, Parade Magazine, 1 October, pp. 18‐19.