Mann, H. T., & Williamson, D. (1976). Water treatment and sanitation: A handbook of simple methods for rural areas in developing countries (Revised ed.). Intermediate Technology Publications.
Dyfyniad Arddull ChicagoMann, H. T., and D. Williamson. Water Treatment and Sanitation: A Handbook of Simple Methods for Rural Areas in Developing Countries. Revised ed. London: Intermediate Technology Publications, 1976.
Dyfyniad MLAMann, H. T., and D. Williamson. Water Treatment and Sanitation: A Handbook of Simple Methods for Rural Areas in Developing Countries. Revised ed. Intermediate Technology Publications, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.