Nurlita M. Pengembangan Soal Terbuka (Open-Ended Problem) pada Mata Pelajaran Matematika SMP Kelas VIII. Pythagoras [Internet]. 2015 Jun. 11 [cited 2025 Sep. 23];10(1):38-49. Available from: https://jurnal.uny.ac.id/index.php/pythagoras/article/view/9106