Sebayang, L., and Sheny Sandra Kaihatu. “Land Suitability Assessment Gambir Commodities (Uncaria Gambir Roxb.) In Pakpak Bharat Distric Scale 1 : 50.000”. Jurnal Online Pertanian Tropik, vol. 11, no. 1, May 2024, pp. 1-6, doi:10.32734/jopt.v11i1.15868.