Mahendra, R.A.R.; Attanayaka, D.P.S.T.G.; Chandrasekharan, N.V.; Ranathunga, R.A.C.A.; Withanage, S.P.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Waduge, T.D.; Attanayaka, D.P.S.T.G.; Edirisinghe, N.M.H.; Chandrasekeran, N.V.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)