SIREGAR, Torang; RHAMAYANTI, Yuni. Human Logical Thinking in Mathematical Concepts: The Ethnomathematics of Batak Mandailing and Batak Toba Ulos. EIKI Journal of Effective Teaching Methods, London, U.K., v. 4, n. 3, 2026. DOI: 10.59652/e5tqs026. Disponível em: https://journals.eikipub.com/index.php/jetm/article/view/865. Acesso em: 17 oct. 2026.