TAMBUN, YOSEF MANIK, R. Value Chain Analysis of Cassava (Manihot Esculeta) in Toba Samosir Regency, North Sumatera, Indonesia. Journal of Engineering and Scientific Research, [S. l.], v. 2, n. 1, p. 39–43, 2020. DOI: 10.23960/jesr.v2i1.41. Disponível em: https://jesr.eng.unila.ac.id/index.php/ojs/article/view/41. Acesso em: 28 jun. 2022.