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Dyfyniad Arddull ChicagoValuing the Environment: Economic Approaches to Environmental Evaluation : Proceedings of a Workshop Held at Ludgrove Hall, Middlesex Polytechnic, on 13 and 14 June 1990. Chichester: J. WIley & Sons, 1995.
Dyfyniad MLAValuing the Environment: Economic Approaches to Environmental Evaluation : Proceedings of a Workshop Held at Ludgrove Hall, Middlesex Polytechnic, on 13 and 14 June 1990. J. WIley & Sons, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.