Balasuriya, B.K.A.; Bandupriya, H.D.D.; Fernando, S.C.(Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, 2005)
Satharasinghe, S.; Bandupriya, H.D.D.; Vidhanaarachchi, V.R.M.; De Silva, S.N.T.(Faculty of Agriculture and Plantation Management,Wayamba University of Sri Lanka, Makandura, 2013)