Biblio

D. Saywell and Shaw, R., “Technical brief no. 61 : on-plot sanitation in urban areas”, Waterlines, an international journal of water, sanitation and waste, pp. p. 17-20 : 3 drwngs., 4 tab., 1999.

D. W. Sutcliffe, The microbiological quality of water, vol. no. 5. Ambleside, UK: Freshwater Biological Association, 1997.

R. N. Middleton, “Making VIP latrines succeed”, Waterlines, an international journal of water, sanitation and waste, pp. p. 27-29: 1 fig., 3 photogr., 1995.

M. Verhaegh, “Water the spring of life : a research on the quality of drinking-water in the Mantsonyane area”. University of Maastricht, Maastricht, The Netherlands, p. 44 p. + 24 p. ann.: fig., tab., 1990.

James M. Montgomery Consulting Engineers -Pasadena, CA, US, Water treatment principles and design. New York, NY, USA: Wiley, 1985, p. xii, 696 p.: fig., tab.

C. M. Palmer, Algae and water pollution : the identification, significance, and control of algae in water supplies and in polluted water. Tunbridge Wells, UK: Castle House Publications, 1980, p. 123 p. : 73 fig., 8 plates, 24 tab.