World Bank. (2013). Africa development indicators 2012/2013. The World Bank.
Chicago Style (17th ed.) CitationWorld 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:這些引文格式不一定是100%准確.