1. World Commission on Sustainable Development, 1987, Our Common Future, United Nations.
2. S. Baker, M. Kousis, D. Richardson, S. Young, 1997, The Politics of Sustainable Development, Routledge, London, UK.
3. E.F. Schumacher, 1993, Small is Beautiful, Vintage.
4. B.P. Amoco, 1999, Statistical Review of World Energy, BPAmoco, London, UK.
5. IEA, 1998, Key World Energy Statistics, IEA, Paris, France.