World Bank. (2006). The Little data book on Africa, 2006. World Bank.
芝加哥风格引文World Bank. The Little Data Book on Africa, 2006. Washington, D.C: World Bank, 2006.
MLA引文World Bank. The Little Data Book on Africa, 2006. World Bank, 2006.
警告：这些引文格式不一定是100％准确.