1. 2004 Special Focus the Consumer Society;State of the World,2004
2. 2004 Special Focus the Consumer Society;State of the World,2004
3. WSSD Plan of Implementation. http://www.un.dk/Johannesbourg_Facts/PlanFinal.pdf.
4. Millennium Development Goals. http://www.un.org/millenniumgoals/
5. Why take a life cycle approach?;UNEP,2005