Dingal , Alfredo G., et al. “NOTE: EFFECT OF SETT TYPE ON THE PERFORMANCE OF TUGUI [Dioscorea Esculenta (Lour) Burk.]”. Annals of Tropical Research, vol. 9, no. 4, Nov. 1987, pp. 244-8, https://atr.vsu.edu.ph/article/view/670.