Neranjika, V.P.M.; Abeynayake, N.R.; Fernando, M.T.N.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Muhsin, A.M.I.; Fernando, M.T.N.; Athauda, A.M.T.P.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)