Jayaweera, Y.U.; Hennayaka, H.M.A.I.; Herath, H.M.L.P.B.; Manatunga, D.C.; Gajanayake, P.; Mahagamage, M.G.Y.L.(The Open university of Sri Lanka, 2024)
Hewage, I.S.; Rathnayake, R.M.K.M.; Piyasena, R.K.N.P.; Muhandiram, P.M.S.R.; Weerasinghe, K.G.N.H.; Halwatura, R.U.(The Open university of Sri Lanka, 2024)
De Silva, H.S.A.; Bandara, A.D.R.P.; Arachchi, L.A.G.; Jayasinghe, R.R.; Hendawitharana, M.P.; Abeyrathna, W.P.(The Open university of Sri Lanka, 2024)