Dyfyniad APA

World Bank. (2001). World development indicators. Washington: The World Bank.

Dyfyniad Arddull Chicago

World Bank. World Development Indicators. Washington: The World Bank, 2001.

Dyfyniad MLA

World Bank. World Development Indicators. Washington: The World Bank, 2001.

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