Cita APA (7th ed.)

World Bank & ebrary, Inc. (2012). World development indicators: 2012. World Bank.

Cita Chicago (17th ed.)

World Bank i Inc ebrary. World Development Indicators: 2012. Washington, D.C.: World Bank, 2012.

Cita MLA (9th ed.)

World Bank i Inc ebrary. World Development Indicators: 2012. World Bank, 2012.