Wickramarathne, M.S.; Kelaniyangoda, D.B.; Ranaweera, B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Sajeewani, M.A.I.; Withanage, S.P.; Attanayaka, D.P.S.T.G.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Gunarathna, K.M.S.U.; Chandrasekara, A.; Abeynayake, N.R.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)