Dyfyniad APA

Organisation for Economic Co-operation and Development & OECD iLibrary. (2013). Environment at a glance 2013: OECD indicators. OECD.

Dyfyniad Arddull Chicago

Organisation for Economic Co-operation and Development and OECD iLibrary. Environment at a Glance 2013: OECD Indicators. Paris: OECD, 2013.

Dyfyniad MLA

Organisation for Economic Co-operation and Development and OECD iLibrary. Environment at a Glance 2013: OECD Indicators. OECD, 2013.

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