1. National Atlas of India, 1980: National Atlas & Thematic Mapping Organisation, Calcutta, 101 pp.
2. Chowdhury, A., Ramasastri, K. S., Rentala, G. S., 1977: A study of agricultural drought of 1965 and 1966 kharif season. Pre. Publ. Sci. Rep. No. 77/4, Ind. Met. Dept.
3. Doorenbos, J., Pruitt. W. O., 1975: Prediction of irrigation water requirements of crops. Irrigation and Drainage Paper, 24, FAO, Rome, 179.
4. Frere, M., Popov, G. F., 1979: Agrometeorological crop monitoring and forecasting. Plant Production and Protection Paper No. 17, FAO, Rome.
5. George, C. J., Ramasastry, K. S., 1971: Drought of the kharif season of 1971. Sci. Rep. No. 185, Ind. Met. Dept..