Ozawa, S.; Dassanayake, G.; Patu, V.; Tonooka, H.; Noguchi, H.; Itaba, M.; Minato, A.; Karunathilake, K.(Faculty of Social Sciences, University of Kelaniya, 2009)
Jayamanna, G.G.M.D.T.; Dharmadasa, R.A.P.I.S.; Abeysekara, N.N.R.; Ekanayake, E.M.J.B.(Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2015)