Folmer, H. (1989). Valuation methods and policy making in environmental economics: Selected and integrated papers from the Congress "Environmental Policy in a Market Economy", Wageningen, The Netherlands, 8-11 September 1987. Elsevier.
Lua i Stíl Chicago (17ú heag.)Folmer, H. Valuation Methods and Policy Making in Environmental Economics: Selected and Integrated Papers from the Congress "Environmental Policy in a Market Economy", Wageningen, The Netherlands, 8-11 September 1987. Amsterdam: Elsevier, 1989.
Lua MLA (9ú heag.)Folmer, H. Valuation Methods and Policy Making in Environmental Economics: Selected and Integrated Papers from the Congress "Environmental Policy in a Market Economy", Wageningen, The Netherlands, 8-11 September 1987. Elsevier, 1989.
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