Wanigaratne, R.D.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1978)
Wanigaratne, R.D.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1978)
Wanigaratne, R.D.; Hector Kobbekaduwa Agrarian Research and Training Institute(Hector Kobbekaduwa Agrarian Research and Training Institute:Colombo, 1977)