Purba B, Tarigan DR, Ginting RO. Analisis Kebijakan Sumber Daya Alam Provinsi Sumatera Utara. ERJ [Internet]. 2024 Sep. 2 [cited 2026 Apr. 26];3(3):1071–1078 . Available from: https://www.mes-bogor.com/journal/index.php/mrj/article/view/246