Okun, D. A., & Ernst, W. R. (1987). Community piped water supply systems in developing countries: A planning manual. World Bank.
Citação norma ChicagoOkun, Daniel Alexander, and Walter R. Ernst. Community Piped Water Supply Systems in Developing Countries: A Planning Manual. Washington, D.C: World Bank, 1987.
Citação norma MLAOkun, Daniel Alexander, and Walter R. Ernst. Community Piped Water Supply Systems in Developing Countries: A Planning Manual. World Bank, 1987.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.