Marfuah, Lutfi, Yesi Franita, and Zuida Ratih Hendrastuti. 2023. “Development of Flash-Based Learning Media to Improve Critical Thinking Ability of Grade VII Middle School Students”. Union: Jurnal Ilmiah Pendidikan Matematika 11 (2):191-99. https://doi.org/10.30738/union.v11i2.13290.