BR GINTING, Herli E steria. HOLDING RECREATIONAL SPORTS IN THE GUNDALING HILLS OF BERASTAGI AS A SOURCE OF THE SPORTS INDUSTRY. Indonesia Sport Journal, [S. l.], v. 5, n. 1, p. 21–25, 2022. DOI: 10.24114/isj.v5i1.37879. Disponível em: https://jurnal.unimed.ac.id/2012/index.php/isj/article/view/37879. Acesso em: 8 jun. 2025.