Dyfyniad APA

World Bank. (2013). World Development Indicators 2013. The World Bank.

Dyfyniad Arddull Chicago

World Bank. World Development Indicators 2013. Washington, D.C: The World Bank, 2013.

Dyfyniad MLA

World Bank. World Development Indicators 2013. The World Bank, 2013.

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