Sitinjak, Wahyunita, Zulkarnain Lubis, and Mhd Buhari Sibuea. “Analisis Nilai Tambah Dan Strategi Pengembangan Olahan Kopi Arabika Di Kabupaten Simalungun”. Jurnal Ekuilnomi 5, no. 2 (November 30, 2023): 487 – 494. Accessed May 14, 2026. https://jurnal.usi.ac.id/index.php/ekuilnomi/article/view/2318.