1. Agami, M., 1984. Effects of water pollution on plant species composition along the Amal River, Israel. Arch. Hydrobiol. 100: 445?454.
2. Ali, M. M., 1992. Ecological Studies on Freshwater Macrophytes in Regulated Waterbodies in Egypt and UK. Ph.D. Thesis, Faculty of Science at Aswan, Assiut University: 263 pp.
3. Allen, S. E., H. M. Grimshaw & A. P. Rowland, 1986. Chemical analysis. In Methods in Plant Ecology. P D. Moore & S. B. Chapman (eds), 285?344.
4. American Public Health Association, 1980. Standard Methods for the Examination of Water and Waste Water. Amer. Publ. Health Assoc., Wash. D.C. 874 pp.
5. Best, E. P. H., 1979. Growth substances and dormancy in Ceratophyllum demersum L. Physiol. Plant. 45: 339?406.