HANDAYANI, S.; PERMATASARI, D. Analysis of students’ anxiety based on van Hiele’s levels in solving geometry problems . Beta: Jurnal Tadris Matematika, [S. l.], v. 15, n. 2, p. 133–147, 2022. DOI: 10.20414/betajtm.v15i2.551. Disponível em: https://jurnalbeta.ac.id/index.php/betaJTM/article/view/551. Acesso em: 14 mar. 2026.