Tambun R, Manik Y. Value Chain Analysis of Cassava (Manihot Esculeta) in Toba Samosir Regency, North Sumatera, Indonesia. JESR [Internet]. 2020Jun.30 [cited 2025Jun.28];2(1):39-43. Available from: https://jesr.eng.unila.ac.id/index.php/ojs/article/view/41