1 South Africa. Department of Water Affairs and Forestry. 1994. Algoa Water Resources System analysis: hydrology. Volume 1 of 2. Pretoria, South Africa: Department of Water Affairs and Forestry, Directorate of Project Planning. 132p.
2 South Africa. Department of Water Affairs and Forestry. 1994. Algoa Water Resources System analysis: hydrology. Volume 2 of 2. Pretoria, South Africa: Department of Water Affairs and Forestry, Directorate of Project Planning. 175p.