Munthe, Muhtar Ardansah, Ratna Sari, and Aulia Putra Daulay. “Ecotourism Strategy and Potential of Delleng Simpon, Ulumerah, Pakpak Bharat Regency”. Jurnal Pijar Mipa 19, no. 2 (March 25, 2024): 280–287. Accessed May 24, 2024. https://jurnalfkip.unram.ac.id/index.php/JPM/article/view/6543.