Jailani J, Sugiman S, Apino E. Implementing the problem-based learning in order to improve the students’ HOTS and characters. J. ris. pendidik. mat [Internet]. 2017 Nov. 1 [cited 2025 May 9];4(2):247-59. Available from: https://journal.uny.ac.id/index.php/jrpm/article/view/17674