Jatmiko, Jatmiko, and Nurita Primasatya. “The Use of Multimedia of Geometry Based on Van Hiele Thinking Theory: An Alternative to Improve Critical Thinking Skill of Elementary School Students”. Proceedings of the International Seminar on Business, Education and Science 1, no. 1 (October 22, 2022): 291–300. Accessed January 29, 2023. https://proceeding.unpkediri.ac.id/index.php/ip/article/view/2684.