Samaraweera, S.P.D.P.; Jayasinghe, J.M.U.K.; Gangoda, U.E.K.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Fasmina, M.F.F.; Jayasinghe, J.M.U.K.; Wickramasinghe, W.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)