World Bank. African development indicators. International Bank for Reconstruction and Development / The World Bank.
芝加哥风格引文World Bank. African Development Indicators. Washington, D.C.: International Bank for Reconstruction and Development / The World Bank.
MLA引文World Bank. African Development Indicators. International Bank for Reconstruction and Development / The World Bank.
警告：这些引文格式不一定是100％准确.