ebrary, Inc. (2004). A guide to competitive vouchers in health. World Bank.
Chicago Style (17th ed.) Zitazioaebrary, Inc. A Guide to Competitive Vouchers in Health. Washington, DC: World Bank, 2004.
MLA (9th ed.) Zitazioaebrary, Inc. A Guide to Competitive Vouchers in Health. World Bank, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.