International Energy Agency. (2012). Coal information: 2012 with 2011 data. OECD/IEA.
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Dyfyniad Arddull Chicago
International Energy Agency. Coal Information: 2012 with 2011 Data. France: OECD/IEA, 2012.
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Dyfyniad MLA
International Energy Agency. Coal Information: 2012 with 2011 Data. OECD/IEA, 2012.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.