Dyfyniad APA

International Energy Agency, Organisation for Economic Co-operation and Development, & ProQuest (Firm). (2009). Natural gas market review 2009. OECD : International Energy Agency.

Dyfyniad Arddull Chicago

International Energy Agency, Organisation for Economic Co-operation and Development, and ProQuest (Firm). Natural Gas Market Review 2009. Paris: OECD : International Energy Agency, 2009.

Dyfyniad MLA

International Energy Agency, et al. Natural Gas Market Review 2009. OECD : International Energy Agency, 2009.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.