Putri LE, Hermandra H, Mangatur Sinaga. Umpasa pada Ulaon Sadari Pernikahan Batak Toba Analisis Semantik Kognitif. J. Educ. Res. [Internet]. 2023 Dec. 18 [cited 2025 Sep. 13];4(4):2091-7. Available from: https://jer.or.id/index.php/jer/article/view/584