Sebayang, Lukas, and Sheny Sandra Kaihatu. “Land Suitability Assessment Gambir Commodities (Uncaria Gambir Roxb.) In Pakpak Bharat Distric Scale 1 : 50.000”. Jurnal Online Pertanian Tropik 11, no. 1 (May 6, 2024): 1-6. Accessed November 22, 2024. https://talenta.usu.ac.id/jpt/article/view/15868.