(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1985) Widanapathirana, A.S.; Brewer, J.B.; Agrarian Research and Training Institute
(Hector Kobbeduwa Agrarian Research and Training Institute:Colombo, 1986) Abeyratne, S.ed.; Ganewatta, P.ed.; Merrey, D.ed.; Agrarian Research and Training Institute
