1. Water, Population, and communities;Environment Protection and Biodiversity Conservation Act,1999
2. Design of U.S. Habitat Banking Systems to Support the Conservation of Wildlife Habitat and At-Risk Species;W Baumol;Environmental Law Institute Bertoldi, P. and T. Huld. 2006. Tradable certificates for renewabe electricity and energy savings,1988
3. White, Green and brown Certificates: How to make the most of them;P Bertoldi;ECEEE 2005 Summer Study. Paper # 7203,2000
4. Does Cost-Share Replicate Water Quality Trading Projects? Implications for a Possible Partnership;H L Breetz;Review of Agricultural Economics,2007
5. Water Quality Trading and Offset Initiatives in the US: A Comprehensive Survey;H L Breetz;Journal of Forestry,2004