Jelaskan Umbu dari Gowirio dalam bahasa nias

FAO, June 2003 cassava market assessment, 2003

Cereda, M.P. and Mattos, M.C.Y. (1996). "Linamarin - The Toxic Compound of Cassava". Journal of Venomous Animals and Toxins (online) 2 (1), 6-12; ISSN 0104-7930