Pradit Pongtongkam, Kanchana Klakhaeng, Paderm Ratisoontorn, Saowanee Suputtitada, Surin Peyachoknagul, Nitsri Sangduen, Chairerk Maneepongse and Hathairat Uraivong 1993. Immature Embryo Culture in Hybrid Rice. Agriculture and Natural Resources. 27, 1 (Mar. 1993), 15–19.