RATNO, Puji; SIAHAAN, Josephin. Survey Tingkat Kebugaran Jasmani Skipper Arung Jeram Exsplore Sumatera Kabupaten Langkat. JURNAL ILMU KEOLAHRAGAAN, [S. l.], v. 17, n. 1, p. 37–49, 2018. DOI: 10.24114/jik.v17i1.9962. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/JIK/article/view/9962. Acesso em: 14 agu. 2025.