Efni, Latifa, Yerizon Yerizon, and Elita Zusti Jamaan. “Development of Mathematics Learning Devices With GDL Models to Improve Mathematical Problem-Solving Ability of Class VII Junior High School”. Jurnal Bintang Pendidikan Indonesia 2, no. 4 (August 5, 2024): 57–65. Accessed November 22, 2024. https://ejurnal.stie-trianandra.ac.id/index.php/JUBPI/article/view/3247.