SUNARDI, S.; YUDIANTO, E. .; SUSANTO, S.; KURNIATI, . D. .; CAHYO, . R. D. .; SUBANJI, S. Anxiety of Students in Visualization, Analysis, and Informal Deduction Levels to Solve Geometry Problems. International Journal of Learning, Teaching and Educational Research, [S. l.], v. 18, n. 4, p. 171–185, 2019. Disponível em: https://ijlter.myres.net/index.php/ijlter/article/view/580. Acesso em: 29 apr. 2026.