Efni L, Yerizon Yerizon, Zusti Jamaan E. Development of Mathematics Learning Devices with GDL Models to Improve Mathematical Problem-Solving Ability of Class VII Junior High School. JUBPI [Internet]. 5 Agustus 2024 [dikutip 31 Oktober 2024];2(4):57-65. Tersedia pada: https://ejurnal.stie-trianandra.ac.id/index.php/JUBPI/article/view/3247