APA (7th ed.) Zitazioa

(1981). Economics of environmental and: Natural resources policy. Westview Pr..

Chicago Style (17th ed.) Zitazioa

Economics of Environmental and: Natural Resources Policy. Bouldere, Colo.: Westview Pr., 1981.

MLA (9th ed.) Zitazioa

Economics of Environmental and: Natural Resources Policy. Westview Pr., 1981.