APA (7th ed.) Zitazioa
(2014). World development indicators, 2014. The World Bank.
Chicago Style (17th ed.) Zitazioa
World Development Indicators, 2014. Washington, District of Columbia: The World Bank, 2014.
MLA (9th ed.) Zitazioa
World Development Indicators, 2014. The World Bank, 2014.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.