Madushani, H.D.P.; Nayomi, W.V.P.N.; Dasanayake, D.M.H.; Perera, L.G.D.(Social Statistics Students’ Association, Department of Economics, University of Kelaniya, 2015)
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)
Madushani, H.D.P.; Nayomi, W.V.P.N.; Dasanayake, D.H.M.; Perera, L.G.D.(Social Statistics Students’ Association, Department of Economics, University of Kelaniya, 2015)