World Bank & ebrary, Inc. (2012). The little data book: 2012. World Bank.
芝加哥风格引文World Bank 与 Inc ebrary. The Little Data Book: 2012. Washington, D.C.: World Bank, 2012.
MLA引文World Bank 与 Inc ebrary. The Little Data Book: 2012. World Bank, 2012.
警告：这些引文格式不一定是100％准确.