APA aipamena

The World Bank. (2008). World development indicators 2008. Washington, DC: World Bank.

Chicago Style aipamena

The World Bank. World Development Indicators 2008. Washington, DC: World Bank, 2008.

MLA aipamena

The World Bank. World Development Indicators 2008. Washington, DC: World Bank, 2008.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.