Rhosyida, Nelly, Trisniawati Trisniawati, and Flora Grace Putrianti. “Kemampuan Pemecahan Masalah Matematis Mahasiswa PGSD Pada Masalah Open-Ended”. Union : Jurnal Ilmiah Pendidikan Matematika 6, no. 3 (November 9, 2018): 329–338. Accessed January 30, 2023. https://jurnal.ustjogja.ac.id/index.php/union/article/view/3147.