1. Allanson, B. R. and J. M. T. M. Gieskes, 1961. Investigations into the ecology of polluted waters in the Transvaal. Part II. An introduction to the limnology of Hartbeespoort Dam with special reference to the effect of industrial and domestic pollution. Hydrobiol., 18: 77–94.
2. Dillon, P. J., 1975. The phosphorus budget of Cameron Lake, Ontario: The importance of flushing rate to the degree of eutrophy of lakes. Limnol. Oceanogr., 20: 28–39.
3. Falconer, A. C., B. E. Marshall and D. S. Mitchell, 1970. Hydrobiological studies of Lake McIlwaine in relation to its pollution, 1968 and 1969. University of Rhodesia Rep., Salisbury.
4. Grobbelaar, J. U., P. C. Keulder and P. Stegmann, 1980. Some properties of suspended sediment adsorbed cations in turbid freshwaters of South Africa. J. Limnol. Soc. Sth. Afr., 6: 55–58.
5. Hemens, J., D. E. Simpson and R. J. Warwick, 1977. Nitrogen and phosphorus input to the Midmar Dam, Natal. Water SA, 3: 193–201.