Somaratne, P. G.; Jinapala, K.; Perera, L. R.; Ariyaratne, B. Ranjith; Bandaragoda, D. J.; Makin, Ian(International Water Management Institute, Colombo, Sri Lanka, 2003)
de Fraiture, Charlotte; Cai, Ximing; Amarasinghe, Upali A.; Rosegrant, Mark; Molden, David(Comprehensive Assessment of Water Management in Agriculture, Colombo, Sri Lanka, 2004)