International Energy Agency, Organisation for Economic Co-operation and Development, & ProQuest (Firm). (2011). Coal information 2011, with 2010 data. International Energy Agency.
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Dyfyniad Arddull Chicago
International Energy Agency, Organisation for Economic Co-operation and Development, and ProQuest (Firm). Coal Information 2011, with 2010 Data. [Paris]: International Energy Agency, 2011.
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Dyfyniad MLA
International Energy Agency, et al. Coal Information 2011, with 2010 Data. International Energy Agency, 2011.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.