Senanayake, S.R.H.L.K.; Kodithuwakku, K.A.H.T.; Wickramasinghe, H.K.J.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)
Wickramasinghe, H.K.J.P.; Kodithuwakku, K.A.H.T.; Jayasooriya, A.P.; Prathapasinghe, G.A.(Senate Research and Higher Degrees Committee, Wayamba University of Sri Lanka, 2017)