HARTANTO, Deddy. Implementation Of PBL As An Effort To Improve Students’ Collaboration Skills. Journal of Education Research, [S. l.], v. 4, n. 4, p. 1693–1701, 2023. DOI: 10.37985/jer.v4i4.485. Disponível em: https://jer.or.id/index.php/jer/article/view/485. Acesso em: 31 jul. 2025.