Sitanggang, Mey Gracia, Rawiyah, Goffri Simarsoit, Ian Pedrosa manatap Lumban Gaol, Hery Judika Lumban Tobing, and Tomi Arianto. “Struktur Graf Berarah Pada Sistem Kekerabatan Batak Toba (Dalihan Na Tolu)”. JUMAT: Jurnal Matematika 3, no. 2 (December 20, 2025): 101–112. Accessed September 20, 2026. https://e-journal.iainfmpapua.ac.id/index.php/jumat/article/view/2052.