World Bank & ebrary, Inc. (2012). World development indicators: 2012. World Bank.
Chicago Style (17th ed.) CitationWorld Bank and Inc ebrary. World Development Indicators: 2012. Washington, D.C.: World Bank, 2012.
MLA引文World Bank and Inc ebrary. World Development Indicators: 2012. World Bank, 2012.
警告:這些引文格式不一定是100%准確.