Organisation for Economic Co-operation and Development. Working Party on Environmental Performance, ProQuest (Firm), & Omersu, G. (2012). Germany 2012. OECD.
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Dyfyniad Arddull Chicago
Organisation for Economic Co-operation and Development. Working Party on Environmental Performance, ProQuest (Firm), and Gerhard Omersu. Germany 2012. [Paris]: OECD, 2012.
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Dyfyniad MLA
Organisation for Economic Co-operation and Development. Working Party on Environmental Performance, et al. Germany 2012. OECD, 2012.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.