Okun, D. A., & Ernst, W. R. (1987). Community piped water supply systems in developing countries: A planning manual. World Bank.
芝加哥风格引文Okun, Daniel Alexander, 与 Walter R. Ernst. Community Piped Water Supply Systems in Developing Countries: A Planning Manual. Washington, D.C: World Bank, 1987.
MLA引文Okun, Daniel Alexander, 与 Walter R. Ernst. Community Piped Water Supply Systems in Developing Countries: A Planning Manual. World Bank, 1987.
警告：这些引文格式不一定是100％准确.