1. Agenda 21 http://www.un.org/esa/sustdev/agenda21.htm
2. Strategies for manufacturing;Frosch Robert;Scientific American September,1989
3. Füssler C., Cramer A., van der Vegt S., Raising the Bar, Greenleaf Publishing 2004 ISBN 1874719829.
4. Smart Regulation–designing environmental policy;Gunningham,1998
5. Leaders and Laggardsmnext generation environmental regulation;Gunningham,2002