YANTO, Febri; ENJONI, Enjoni. The Effectiveness of the Problem-Based Learning Model to Improve the Students’ 21st Century Skills. Indonesian Research Journal in Education |IRJE|, [S. l.], v. 6, n. 2, p. 232–242, 2022. Disponível em: https://www.online-journal.unja.ac.id/irje/article/view/20786. Acesso em: 17 apr. 2026.