1. Our common future,1987
2. Agenda 21: the earth summit strategy to save our planet;Sitarz,1993
3. United Nations Division for Sustainable Development. Indicators of sustainable development. See also: 〈http://www.un.org/esa/sustdev/natlinfo/indicators/isdms2001/table_4.htm〉.
4. 2005 environmental sustainability index: benchmarking national environmental stewardship;Esty,2005
5. 2002 Environmental Sustainability Index. An initiative of global leaders of tomorrow environment task force. World economic forum, annual meeting 2002, in collaboration with Yale Center for Environmental Law and Policy, Yale University, Center for International Earth Science Information Network, Columbia University. See also: 〈http://sedac.ciesin.columbia.edu/es/esi/ESI2002_21MAR02a.pdf〉.