1. Resource Productivity: Making More with Less,2001
2. DEFRA (Department for Environment, Food & Rural Affairs) e-Digest Statistics about: waste and recycling http://www.defra.gov.uk/environment/statistics/waste/index.htm (web page published 10 September 2003)
3. Factor Four;Von Weizsacker,1997
4. Graphic Designers Greenbook;Chick,1992
5. EU Focus on Waste Management,1999