SARI, N.; SARAGIH, S. .; NAPITUPULU, E. E. . Developing a Hypothetical Learning Trajectory with Problem-Based Learning and a Learning Medium for Middle School. Educational Administration: Theory and Practice, [S. l.], v. 30, n. 1, 2023. DOI: 10.52152/kuey.v30i1.714. Disponível em: http://kuey.net/index.php/kuey/article/view/714. Acesso em: 18 may. 2024.