World Bank. (1999). International financial statistics: Yearbook. World Bank.
Cita Chicago (17th ed.)World Bank. International Financial Statistics: Yearbook. Washington, D.C.: World Bank, 1999.
Cita MLA (9th ed.)World Bank. International Financial Statistics: Yearbook. World Bank, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.