World Bank & World Bank. (2005). A guide to competitive vouchers in health. World Bank.
Chicago (17e ed.) BronvermeldingWorld Bank en World Bank. A Guide to Competitive Vouchers in Health. Washington, DC: World Bank, 2005.
MLA (9e ed.) BronvermeldingWorld Bank en World Bank. A Guide to Competitive Vouchers in Health. World Bank, 2005.