Warnakulasooriya, W.M.S.; de Silva, D.A.M.; Yapa, P.I.(Research Centre for Social Sciences, Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2016)
Kularathne, M.G.; de Silva, D.A.M.; Hettiarachchi, I.C.(Research Centre for Social Sciences, Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2016)