Novita R, Prahmana RCI, Fajri N, Putra M. Penyebab kesulitan belajar geometri dimensi tiga. J. ris. pendidik. mat [Internet]. 2018 May 22 [cited 2025 May 18];5(1):18-29. Available from: https://journal.uny.ac.id/index.php/jrpm/article/view/16836