Warnasuriya, W.M.A.N.; Wijetilaka, L.C.; Ranaweera, B.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Ekanayake, E.M.M.S.; Wijetilaka, L.C.; Ranaweera, B.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)