1. The impact of voluntary environmental protection instruments on company environmental performance;Annandale;Business Strategy and the Environment,2004
2. Voluntary Approaches for Environmental Policy in OECD Countries, An Assessment;Borkey,1999
3. Briefing on Selected Sustainable Development Tools Final report to the English Regions Network;CAG Consultants,2003
4. The impact of Six Sigma in the performance of a pollution prevention program;Calia;Journal of Cleaner Production,2009
5. Campbell, I., 2005. Department of the Environment and Heritage (December 2005) Australian Government, Transcript Senator the Hon. Ian Campbell, Talking Points for Minister, 4th Municipal Leaders Summit on Climate Change.