APA (7th ed.) Zitazioa

World Bank. (2000). Procurement of works. World Bank.

Chicago Style (17th ed.) Zitazioa

World Bank. Procurement of Works. Washington, D.C.: World Bank, 2000.

MLA (9th ed.) Zitazioa

World Bank. Procurement of Works. World Bank, 2000.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.