World Bank. (1997). Health, nutrition & population. Human Development Network of the World Bank Group.
Chicago (17e ed.) BronvermeldingWorld Bank. Health, Nutrition & Population. Washington, D.C.: Human Development Network of the World Bank Group, 1997.
MLA (9e ed.) BronvermeldingWorld Bank. Health, Nutrition & Population. Human Development Network of the World Bank Group, 1997.