1. Ainsworth R. G. J. Ridgway and R. D. Gwilliam. 1978. Corrosion products and deposits in iron mains p. 1-18. Paper 8 Session 2 Water Research Conference on Water Distribution Systems Maintenance of Water Quality and Pipeline Integrity September 1978 Oxford England.
2. American Public Health Association. 1975. Standard methods for the examination of water and wastewater 14th ed. American Public Health Association Washington D.C.
3. Hutchinson M. and J. W. Ridgway. 1977. Microbiological aspects of drinking water supplies p. 179-218. In F. A. Skinner and J. M. Shewan (ed.) Aquatic microbiology. Academic Press Inc. London.
4. Kendall M. G. 1970. Rank correlation methods. Griffin London.
5. Biologically mediated corrosion and its effects on water quality in distribution systems;Lee H. L.;J. Am. Water Works Assoc.,1980