Vitalia Hanako Murni Simanjuntak, & Fernando De Napoli Marpaung. (2025). 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, 7(1), 98–107. https://doi.org/10.31940/senarilip.v7i1.98-107