Permissible Utilisation and Disposal of Sewage Sludge (TT 85/97) (1997) South Africa, Department of Agriculture; South Africa, Department of Health; South Africa, Department of Water Affairs and Forestry; Water Institute of Southern Africa (WISA); Water Research Commission (WRC)
Solid waste management in South Africa (1979) CSIR Technical Guide K47; National Institute for Water Research; CSIR Council for Scientific and Industrial Research; Tworeck, W.C.