EFFORTS TO IMPROVE STUDENT’S SELF-CONFIDENCE THROUGH THE STUDENT TEAMS ACHIEVEMENT DIVISIONS METHOD. Jurnal Mercumatika : Jurnal Penelitian Matematika dan Pendidikan Matematika, [S. l.], v. 4, n. 2, p. 94–101, 2020. DOI: 10.26486/jm.v4i2.989. Disponível em: https://ejurnal.mercubuana-yogya.ac.id/index.php/mercumatika/article/view/989. Acesso em: 13 jun. 2026.