The effect of the cluster umbrella strategy on the achievement of fourth-grade literary students in Islamic education and the development of their harmonious thinking. Journal of Humanities and Social Sciences Research, [S. l.], v. 4, n. 3, 2025. DOI: 10.33687/jhssr.004.03.0485. Disponível em: https://jhssrjournal.com/index.php/journal/article/view/485. Acesso em: 8 may. 2026.