The World Bank. (2006). Africa development indicators 2006. Washington, D.C: The World Bank.
Trích dẫn kiểu ChicagoThe World Bank. Africa Development Indicators 2006. Washington, D.C: The World Bank, 2006.
MLA引文The World Bank. Africa Development Indicators 2006. Washington, D.C: The World Bank, 2006.
警告：这些引文格式不一定是100％准确.