1. Wetzel, R. G. Limnology. 1975. W. B. Saunders Co., Philadelphia.
2. Reid, G. K. Ecology of Inland Waters and Estuaries. 1961. Reinhold Publishing Co., New York.
3. Fisheries Report;JS Dendy,1968
4. Technical Bulletin 207;MH Patriarche,1949
5. Technical Bulletin, 210;RC Ball,1949