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Nadeau, Robert (Lead Author); Cutler J. Cleveland (Topic Editor). 2008. «Environmental and ecological economics. [Архівовано 28 вересня 2009 у Wayback Machine.]» In: Encyclopedia of Earth. Eds. Cutler J. Cleveland (Washington, D.C.: Environmental Information Coalition, National Council for Science and the Environment). First published in the Encyclopedia of Earth December 12, 2007; Last revised August 26, 2008; Retrieved October-6-2009
Nadeau, Robert (Lead Author); Cutler J. Cleveland (Topic Editor). 2008. «Environmental and ecological economics. [Архівовано 28 вересня 2009 у Wayback Machine.]» In: Encyclopedia of Earth. Eds. Cutler J. Cleveland (Washington, D.C.: Environmental Information Coalition, National Council for Science and the Environment). First published in the Encyclopedia of Earth December 12, 2007; Last revised August 26, 2008; Retrieved October-6-2009