1. Aina, E. O. A.; Adedipe, N. O., (1996). Water quality monitoring and environmental status in Nigeria. FEPA Monograph 6, FEPA, Abuja, Nigeria, 239.
2. Calamari, D.; Naeve, H., (1994). Review of pollution in the African aquatic environment. Committee for Inland Fisheries of Africa (CIFA) Technical paper No. 25, FAO, Rome, 118.
3. Chapman, D., (1996). Water quality assessments: A guide to the use of biota, sediments and water in environmental monitoring 2nd. Ed. UNESCO, World Health Organization, United Nations Environment Programme, London.
4. Correll, D. L., (1998). The role of phosphorus and eutrophication of receiving waters. A review. J. Environ. Qual., 27, 261–266 (6 pages)
5. DEAT, (2000).White paper on integrated pollution and waste management for South Africa: A policy on pollution prevention, Waste minimization, impact management and remediation, Department of Environmental Affairs and Tourism, 80.