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Dyfyniad Arddull ChicagoCasella, Alessandra. Market Mechanisms for Policy Decisions: Tools for the European Union. Cambridge: National Bureau of Economic Research, 2000.
Dyfyniad MLACasella, Alessandra. Market Mechanisms for Policy Decisions: Tools for the European Union. National Bureau of Economic Research, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.