Sinulingga, Jekmen, et al. “Upacara Martumpol Etnik Batak Toba : Kohesi Leksikal Analisis Struktural”. Jurnal Pendidikan Tambusai, vol. 8, no. 2, June 2024, pp. 24427-34, http://jptam.org/index.php/jptam/article/view/15792.