Nawarathna, N.D.M.H.C.; Edirisinghe, U.; Ranaweera, B.; Jayaweera, B.P.A.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Senadhipathirage, S.D.A.S.; Ranaweera, B.; Karunarathne, K.H.M.I.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)