Wijewardhana, W.G.L.P.; Edirisinghe, J.; Auwardt, D.M.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2006)
Anuruddhika, R.V.K.; Edirisinghe, J.; Auwardt, D.M.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2006)