Donargo S. POTENSI WISATA ALAM AIR TERJUN EFRATA DI KABUPATEN SAMOSIR. SIBATIK [Internet]. 2025 Sep. 15 [cited 2025 Oct. 19];4(10):3097-116. Available from: https://www.publish.ojs-indonesia.com/index.php/SIBATIK/article/view/3495