1 Sri Lanka. Irrigation Department; IIMI. SLNP. 1996. National Irrigation Rehabilitation Project ALA/91/07: Establishment of Irrigation Research Management Unit - Contract no.669/91/73000/102/141-01 - Final report. Draft report. vii, 83p.
2 Samantha, N. P. G.; Vidanapathirana, R.; Rambukwella, R. 2013. Issues in big onion seed production and marketing. Colombo, Sri Lanka: Hector Kobbekaduwa Agrarian Research and Training Institute (HARTI). 45p. (HARTI Research Report 150)