References
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- Illich , I. 1973 . Tools for Conviviality , London : Calder and Boyars .
- Layard, R. (2006) Happiness: Lessons from a New Science, Penguin, London.
- Ruskin (1860) ‘Ad Valorem in ‘Unto This Last: four essays on the first principles of political economy’, [Online] Available at: http://etext.virginia.edu/toc/modeng/public/RusLast.html (20 June 2011).