1. Handbook of Hydrology;Chow,1964
2. CWRDM, 1991.Relevance of Geomorphology in the hydrological studies of the Kuttiyadi basin.Studies on surface water hydrology of Kuttiyadi River basin. 49-74.
3. CWRDM. 1987. Quantitative geomorphology of the Chaliyar river basin on Malabar Coast.
4. CWRDM. 1995. Water Atlas of Kerala. 54-58.
5. Drainage basin characteristics;Horton;Trans. Amer. Geophysics.Union,1932