Somaratne, P. G.; Jinapala, K.; Perera, L. R.; Ariyaratne, B. Ranjith; Bandaragoda, D. J.; Makin, Ian(International Water Management Institute, Colombo, Sri Lanka, 2003)
Van Koppen, Barbara; Sokile, Charles S.; Hatibu, Nuhu; Lankford, Bruce; Mahoo, Henry F.; Yanda, Pius Z.(International Water Management Institute, Colombo, Sri Lanka, 2004)