Gonneratne, W.; Gunawardena, T.; Ronner, I.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1974)
Chandrasiri, J.K.M.D.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 2005)