APA (7th ed.) Zitazioa

International Energy Agency, Organisation for Economic Co-operation and Development, & ProQuest (Firm). (2008). Natural gas information: With 2007 data. OECD/IEA.

Chicago Style (17th ed.) Zitazioa

International Energy Agency, Organisation for Economic Co-operation and Development, eta ProQuest (Firm). Natural Gas Information: With 2007 Data. Paris: OECD/IEA, 2008.

MLA (9th ed.) Zitazioa

International Energy Agency, et al. Natural Gas Information: With 2007 Data. OECD/IEA, 2008.