Biblio

P. Esterhuysen and Findlay, A., “The call that changed the school”. Mvula Trust, Braamfontein, South Africa, p. 24 p. : ill., 1999.

A. W. Korf, Wilken, J. W., and Nel, N. J., “Strategies and management models for metropolitan wastewater, implementation and evaluation in the East Rand, South Africa”, Water science and technology, pp. p. 101-108 : 3 fig., 2 tab., 1996.