AYU, S. F.; SUNNY , R.; RAHMANTA. Risk Analysis and Calculation of Insurance Premiums on Coffee Export Activities in North Sumatera Province. Indonesian Journal of Agricultural Research, [S. l.], v. 3, n. 2, p. 65–76, 2020. DOI: 10.32734/injar.v3i2.3968. Disponível em: https://talenta.usu.ac.id/InJAR/article/view/3968. Acesso em: 19 aug. 2025.