Ostrom, Elinor(Workshop in Political Theory and Policy Analysis, and the Center for the Study of Institutions, Population and Environmental Change, Indiana University, Bloomington, IN, 1999)
Somaratne, P. G.; Jinapala, K.; Perera, L. R.; Ariyaratne, B. Ranjith; Bandaragoda, D. J.; Makin, Ian(International Water Management Institute, Colombo, Sri Lanka, 2003)