Kasih, F. E., A. Y. S. Saragih, G. Sianturi, R. Sibarani, and I. Silaban. “The Function of Martonggo Raja in the Saur Matua Tradition in Toba Batak”. Jurnal Pembelajaran Bahasa Dan Sastra, vol. 5, no. 3, May 2026, pp. 1937-44, doi:10.55909/jpbs.v5i3.1321.