DEDI IRAWAN; BORNOK SINAGA; ELMANANI SIMAMORA. Developing a Learning Tool Based on the Problem-Based Learning Model to Improve Students’ Problem Solving and Collaboration Skills. Jurnal Perspektif, [S. l.], v. 10, n. 1, p. 237–247, 2026. DOI: 10.15575/jp.v10i1.458. Disponível em: http://perspektif.uinsgd.ac.id/index.php/JP/article/view/458. Acesso em: 14 may. 2026.