Ayu, Sri Fajar, Rainal Sunny, and Rahmanta. “Risk Analysis and Calculation of Insurance Premiums on Coffee Export Activities in North Sumatera Province”. Indonesian Journal of Agricultural Research 3, no. 2 (July 4, 2020): 65 - 76. Accessed November 24, 2024. https://talenta.usu.ac.id/InJAR/article/view/3968.