APA-čujuhus (7. p.)
Organisation for Economic Co-operation and Development & ProQuest (Firm). (2009). Coal information 2009: With 2008 data. OECD/IEA.
Chicago-čujuhus (17. p.)
Organisation for Economic Co-operation and Development juo ProQuest (Firm). Coal Information 2009: With 2008 Data. Paris, France: OECD/IEA, 2009.
MLA-čujuhus (9. p.)
Organisation for Economic Co-operation and Development juo ProQuest (Firm). Coal Information 2009: With 2008 Data. OECD/IEA, 2009.
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