APA (7th ed.) Zitazioa

World Bank. (2015). World development indicators 2015. World Bank Group.

Chicago Style (17th ed.) Zitazioa

World Bank. World Development Indicators 2015. Washington, District of Columbia: World Bank Group, 2015.

MLA (9th ed.) Zitazioa

World Bank. World Development Indicators 2015. World Bank Group, 2015.