Situmorang, Boy Uli Kirana, Isnaini Harahap, and Muhammad Ikhsan Harahap. “The Influence of International Coffee Prices, Rupiah Exchange Rates, and Competitor Commodity Prices (cocoa), on Indonesian Coffee Exports for the 2003-2022 Period”. Jurnal Mantik 7, no. 2 (August 30, 2023): 991-1003. Accessed October 22, 2026. https://iocscience.org/ejournal/index.php/mantik/article/view/3997.