APA
Walker I. (. a., The World Bank, . (2000). Pricing, subsidies, and the poor: demand for improved water services in Central America. Washigton: World Bank.
Chicago
Walker Ian (et al), The World Bank, . 2000. Pricing, subsidies, and the poor: demand for improved water services in Central America. Washigton: World Bank.
Harvard
Walker I. (. a., The World Bank, . (2000). Pricing, subsidies, and the poor: demand for improved water services in Central America. Washigton: World Bank.
MLA
Walker Ian (et al), The World Bank, . Pricing, subsidies, and the poor: demand for improved water services in Central America. Washigton: World Bank. 2000.