Gaya APA

Valuing environmental preferences : theory and practice of the contingent valuation method in the US, EU, and developing countries [sumber elektronik] / editors by Ian J. Bateman and Kenneth G. Willis. (1999). : .

Gaya MLA

Valuing environmental preferences : theory and practice of the contingent valuation method in the US, EU, and developing countries [sumber elektronik] / editors by Ian J. Bateman and Kenneth G. Willis. Ed. Ke- 1. : , 1999. Text.