1. International Union for Conservation of Nature and Natural Resources (IUCN), World Conservation Strategy; 1980, International Union for Conservation of Nature and Natural Resources (IUCN): Switzerland.
2. World Commission on Environment and Development (WCED). Our Common Future, Brundtland GH, editor; 1987, New York: United Nations General Assembly. p. 374.
3. Intergovernmental Panel on Climate Change (IPCC), GEO 4: Environment for Development; 2007. Malta: United Nations Environment Programme (UNEP).
4. Sustainable development: a critical review;Lele;World Dev,1991
5. Sustainability and sustainable development: historical and conceptual review;Mebratu;Environ Impact Assess,1998