Sunardi, S., Yudianto, E. ., Susanto, S., Kurniati, . D. ., Cahyo, . R. D. . and Subanji, S. (2019) “Anxiety of Students in Visualization, Analysis, and Informal Deduction Levels to Solve Geometry Problems”, International Journal of Learning, Teaching and Educational Research, 18(4), pp. 171–185. Available at: https://ijlter.myres.net/index.php/ijlter/article/view/580 (Accessed: 29 April 2026).