Rajagukguk, R., T. Malems, and M. Ginting. “Preserving Linguistic Diversity: Strategies for Language Preservation and Cultural Heritage Safeguarding”. Jurnal Ilmu Pendidikan Dan Humaniora, vol. 11, no. 3, Sept. 2022, pp. 221-36, doi:10.35335/jiph.v11i3.25.