Barus, Despyanti Br. “Pengembangan Media Pembelajaran Matematika Berbasis Budaya Batak Toba”. Cartesius : Jurnal Pendidikan Matematika 2, no. 2 (January 9, 2020): 45–61. Accessed October 21, 2025. https://ejournal.ust.ac.id/index.php/CARTESIUS/article/view/605.