Chaturika, W.D.M.; Sandarenu, S.M.S.; Madhushanka, R.W.B.M.D.; Wijenayaka, W.M.L.K.; Pahalage, G.G.J.; Damayanthi, M.K.N.(Faculty of Social Sciences, University of Kelaniya, Sri Lanka, 2015)
Hettiarachchi, H.A.S.S.; Dissanayake, A.A.P.; Niroshan, D.M.M.; Damayanthi, M.K.N.(Social Statistics Students’ Association, Department of Economics, University of Kelaniya, 2015)