1. Determinants of farmers' willingness to pay for soil conservation practices in the southeastern highlands of Ethiopia;Asrat;Land Degradation and Development,2004
2. Environmental cost of soil erosion in Sri Lanka: Tax/Subsidy policy options;Bandara;Environmental Modelling and Software,2001
3. CEB (Ceylon Electricity Board). 2006, Long Term Generation Expansion Planning Studies 2006–2015. Transmission and Generation Planning Branch, Ceylon Electricity Board, Sri Lanka.
4. Dept. of Census and Statistics. 2007, Department of Census and Statics, Handbook of Census and Statics, Sri Lanka 2007.
5. Dept. of Census and Statistics. 2008, Department of Census and Statics, Handbook of Census and Statics, Sri Lanka 2008.