World Bank & ebrary, Inc. (2009). The little data book on Africa. World Bank.
芝加哥风格引文World Bank 与 Inc ebrary. The Little Data Book on Africa. Washington, D.C.: World Bank, 2009.
MLA引文World Bank 与 Inc ebrary. The Little Data Book on Africa. World Bank, 2009.
警告：这些引文格式不一定是100％准确.