1. Microeconometrics: Methods and applications;Cameron,2005
2. Federalism and environmental protection: Case studies for drinking water and ground-level ozone;Congressional Budget Office (CBO),1997
3. The new federalism game: Primacy implementation of environmental policy;Crotty;Publius,1987
4. The environmental consequences of decentralizing the decision to decentralize;Cutter;Journal of Environmental Economics and Management,2007
5. Environmental Council of the States. http://www.ecos.org (Last viewed: January 2010).