World Bank. (2013). Africa development indicators 2012/2013. The World Bank.
芝加哥风格引文World Bank. Africa Development Indicators 2012/2013. Washington, DC: The World Bank, 2013.
MLA引文World Bank. Africa Development Indicators 2012/2013. The World Bank, 2013.
警告：这些引文格式不一定是100％准确.