Riah Ate Tarigan, Ruth, Sri Setyaningrum, and Muhammad Hafis. “STRATEGI PENGEMBANGAN USAHATANI TANAMAN KOPI (Coffea Arabika)”. Penerbit Tahta Media (April 29, 2023). Accessed October 21, 2026. https://tahtamedia.co.id/issj/article/view/383.