1. American Public Health Association: 1980, Standard Methods for the Examination of Water and Wastewater, Washington, D.C.
2. EPA 440/5/84-001;D. G. Burden,1984
3. Carlson, R. E.: 1977, ?A Trophic State Index for Lakes?, Limnol. Oceanogr. 22 (2), 361?369.
4. Dunnette, D. A.: 1979, ?A Geographically Variable Water Quality Index Used in Oregon?, Jour. Water Poll. Control Fed. 51 (1), 53?61.
5. Huber, W. C., Brezonik, P. L. and Heany, J.P.: 1983, ?A Classification of Florida Lakes, A Technical Report: Vol. I, Florida Department of Environmental Regulation?, Twin Towers Office Building, 2600 Blair Stone Road, Tallahassee, Florida 32301.