KURNIAWAN, K. The Development Of Problem Based Learning Modeling By Using Environmental To Improve Mastery Learning At Junior High School. Journal of Strategy and Transformation in Educational Management, [S. l.], v. 1, n. 2, p. 33–47, 2024. Disponível em: https://jostem.professorline.com/index.php/journal/article/view/9. Acesso em: 28 nov. 2025.