International Monetary Fund, World Economic Outlook Database, April 2010: Nominal GDP list of countries. Data for the year 2009. "Gross domestic product (2009)" (PDF). The World Bank: World Development Indicators database. World Bank. 1 July 2010. Retrieved 2010-07-05.  Field listing - GDP (official exchange rate), CIA World Factbook "Nominal 2009 GDP for the world and the European Union.". World economic outlook database, April 2010. International Monetary Fund. Retrieved 2010-04-21.