Amadoru, I.J.; Abeysinghe, D.C; Gunathilaka, H.A.W.S.; Kulathilaka, S.H.C.; Dharmadasa, R.M.(Senate Research and Higher Degrees Committee, Wayamba University of Sri Lanka, 2017)
Kulathilaka, S.H.C.; Amadoru, I.J.; Abeysinghe, D.C.; Gunathilaka, H.A.W.S; Dharmadasa, R.M.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)