Dyfyniad APA
International Energy Agency. (2013). World energy outlook 2013. International Energy Agency.
Dyfyniad Arddull Chicago
International Energy Agency. World Energy Outlook 2013. France: International Energy Agency, 2013.
Dyfyniad MLA
International Energy Agency. World Energy Outlook 2013. International Energy Agency, 2013.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.