Amarasinghe, N.H.B.S.; Ranaweera, B.; Suraweera, P.A.C.N.B.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)
Dulshani, L.A.M.N.; Ranaweera, B.; Karunarathne, K.H.M.I.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2016)