World Bank & ebrary, Inc. (2011). The little green data book: 2011. World Bank.
Cita Chicago Style (17a ed.)World Bank y Inc ebrary. The Little Green Data Book: 2011. Washington D.C.: World Bank, 2011.
Cita MLA (9a ed.)World Bank y Inc ebrary. The Little Green Data Book: 2011. World Bank, 2011.
Precaución: Estas citas no son 100% exactas.