Journal of the Association of Environmental and Resource Economists. Cambridge University Press.
Dyfyniad Arddull ChicagoJournal of the Association of Environmental and Resource Economists. Cambridge University Press.
Dyfyniad MLAJournal of the Association of Environmental and Resource Economists. Cambridge University Press.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.