Vig, Norman J. (2006). "Making the Grade? OECD Environmental Performance Review of the United States". Environment: Science and Policy for Sustainable Development. 48 (7): 40–43. doi:10.3200/ENVT.48.7.40-43. S2CID218496537.
Lehtonen, Markku (2006). "Deliberative Democracy, Participation, and OECD Peer Reviews of Environmental Policies". American Journal of Evaluation. 27 (185): 185–200. doi:10.1177/0198214006288283. S2CID154637800.
"Environmental Enforcement Indicators". Environmental Performance Reviews - A Practical Introduction. International Network for Environmental Compliance and Enforcement. Retrieved 8 August 2011.
Vig, Norman J. (2006). "Making the Grade? OECD Environmental Performance Review of the United States". Environment: Science and Policy for Sustainable Development. 48 (7): 40–43. doi:10.3200/ENVT.48.7.40-43. S2CID218496537.
Lehtonen, Markku (2006). "Deliberative Democracy, Participation, and OECD Peer Reviews of Environmental Policies". American Journal of Evaluation. 27 (185): 185–200. doi:10.1177/0198214006288283. S2CID154637800.