WIDIONO, S. Improving Students Activity and Students Learning Outcomes by Using Possing Problem Model. Jurnal Axioma : Jurnal Matematika dan Pembelajaran, [S. l.], v. 1, n. 2, p. 175–182, 2020. Disponível em: https://ejurnal.uij.ac.id/index.php/AXI/article/view/278. Acesso em: 19 apr. 2024.