PRESERVING NIAS LANGUAGE, SUSTAINING CULTURAL IDENTITY: A SYSTEMATIC LITERATURE REVIEW ON LOCAL HERITAGE SUSTAINABILITY. International Conference on Education, Economics, Law, and Technology, [S. l.], v. 1, n. 1, p. 57–65, 2026. DOI: 10.57094/. Disponível em: https://proceedings.uniraya.ac.id/index.php/ICEELT/article/view/8. Acesso em: 4 aug. 2026.