Organisation for economic co-operation and development. (1999). Energy the next fifty years. OECD.
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Dyfyniad Arddull Chicago
Organisation for economic co-operation and development. Energy the Next Fifty Years. France: OECD, 1999.
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Dyfyniad MLA
Organisation for economic co-operation and development. Energy the Next Fifty Years. OECD, 1999.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.