APA (7th ed.) Citation

World Bank & World Bank. International Economics Dept. Development Data Group. (2009). World development indicators 2009. The World Bank.

Chicago Style (17th ed.) Citation

World Bank and World Bank. International Economics Dept. Development Data Group. World Development Indicators 2009. Washington, D.C: The World Bank, 2009.

MLA (9th ed.) Citation

World Bank and World Bank. International Economics Dept. Development Data Group. World Development Indicators 2009. The World Bank, 2009.