Marfuah, Lutfi, Yesi Franita, and Zuida Ratih Hendrastuti. “Development of Flash-Based Learning Media to Improve Critical Thinking Ability of Grade VII Middle School Students”. Union: Jurnal Ilmiah Pendidikan Matematika 11, no. 2 (July 19, 2023): 191–199. Accessed April 19, 2024. https://jurnal.ustjogja.ac.id/index.php/union/article/view/13290.