Titania Budiman, Victor R. Sulangi, and John R. Wenas. “Implementation Of Problem Based Learning Models In Learning Systems Of Linear Equations Three Variables”. Khirani: Jurnal Pendidikan Anak Usia Dini 1, no. 2 (May 28, 2023): 10–17. Accessed April 30, 2024. http://e-journal.nalanda.ac.id/index.php/KHIRANI/article/view/197.