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.

Mann, 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.

Mann, 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.