Organisation for Economic Co-operation and Development. (1999). The Environmental goods and services industry: Manual for data collection and analysis. Organisation for Economic Co-operation and Development.
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Dyfyniad Arddull Chicago
Organisation for Economic Co-operation and Development. The Environmental Goods and Services Industry: Manual for Data Collection and Analysis. Paris, France: Organisation for Economic Co-operation and Development, 1999.
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Dyfyniad MLA
Organisation for Economic Co-operation and Development. The Environmental Goods and Services Industry: Manual for Data Collection and Analysis. Organisation for Economic Co-operation and Development, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.