Dyfyniad APA

World Bank & ebrary, Inc. (2009). World Development Indicators. World Bank Publications.

Dyfyniad Arddull Chicago

World Bank and Inc ebrary. World Development Indicators. Washington: World Bank Publications, 2009.

Dyfyniad MLA

World Bank and Inc ebrary. World Development Indicators. World Bank Publications, 2009.

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