1. Vihreän kuluttajan opas;Elkington,1991
2. European Commission DG Environment. Evaluation of environmental product declaration schemes. Final report. Available from: ; 2002 [accessed 13.10.05].
3. Integrated product policy (IPP). A statement by the European consultative forum on the environment and sustainable development;European Commission,2001
4. Sustainable consumption and production in the European union;European Commission,2004