Mery Silalahi 2023. Local Wisdom In Umpasa Tradition: An Ecolinguistic Perspective. PROSIDING SEMINAR NASIONAL PENDIDIKAN, BAHASA, SASTRA, SENI, DAN BUDAYA. 2, 2 (Nov. 2023), 138–145. DOI:https://doi.org/10.55606/mateandrau.v2i2.1543.