Costanza, R. et al. 2007. Lisbon principles of sustainable governance. In: Encyclopaedia of Earth. Ed. C. J. Cleveland. Environmental Information Coalition, National Council for Science and the Environment, Washington D.C. Published in Encyclopaedia of the Earth August 9, 2007; retrieved February 6, 2009.[1]Archived January 29, 2009, at the Wayback Machine
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Costanza, R. et al. 2007. Lisbon principles of sustainable governance. In: Encyclopaedia of Earth. Ed. C. J. Cleveland. Environmental Information Coalition, National Council for Science and the Environment, Washington D.C. Published in Encyclopaedia of the Earth August 9, 2007; retrieved February 6, 2009.[1]Archived January 29, 2009, at the Wayback Machine
