VITALIA HANAKO MURNI SIMANJUNTAK; FERNANDO DE NAPOLI MARPAUNG. Threats and Preservation Efforts of Local Languages in a Heterogeneous City: A Case Study of Medan, North Sumatra. Prosiding Seminar Nasional Riset Bahasa dan Pengajaran Bahasa, [S. l.], v. 7, n. 1, p. 98–107, 2025. DOI: 10.31940/senarilip.v7i1.98-107. Disponível em: https://ojs2.pnb.ac.id/index.php/SENARILIP/article/view/2908. Acesso em: 10 jan. 2026.