Henegedera, G.M.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 2002)
Somaratne,W. D.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 2002)