Sitompul, Maulidya Silvana Sari. “ETHNOMATHEMATICS IN BUYING AND SELLING TRANSACTIONS CONTUCTED BY MANDAILING COMMUNITY OF MEDAN CITY”. Algebra : Jurnal Pendidikan, Sosial dan Sains 5, no. 3 (August 28, 2025): 466–471. Accessed April 26, 2026. https://ejournal.yana.or.id/index.php/algebra/article/view/1563.