Gunawardena, A.R.; Fernando, T.T.; Jayasekara, S.; Maduwanthi, R.G.I.; Uthpala, K.P.S.; Dayananda, H.N.; Prasangika, L.G.N.(The Open university of Sri Lanka, 2024)
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)