1. American Public Health Association (APHA). (1995). Standard methods for the examination of water & waste water (6th edn.). Washington DC: American Public Health Association.
2. Coscun, Yurteri, Mirat, & Gurol, D. (1987). Removal of dissolved organic contaminants by ozonation. Environmental Progress, 6(4), 240–244.
3. De, A.K. (2002). Environmental chemistry. 4th Edition, New Delhi: New Age International Publishers, pp. 245– 252.
4. EPA; Environmental protection agency, USA (1985). National interim Primary Drinking Water Standards as given by laws E.A. in Water Pollution and Toxicology. Encyclopaedia of Physical Science and Technology 2nd ed; 17, p. 525.
5. Goldmann, C.R., & Horne, A.J. (1983). Limnology, London: McGraw Hill Book Co., p. 464.