The World Bank. (2002). World development indicators 2002. Washington DC: The World Bank.
Chicago Style aipamenaThe World Bank. World Development Indicators 2002. Washington DC: The World Bank, 2002.
MLA aipamenaThe World Bank. World Development Indicators 2002. Washington DC: The World Bank, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.