SUPROTUN, S.; ANDRIYANI, A. Character-Loaded Lift the Flap Book to Enhance Contextual Problem-Solving Skills of Mental Retardation Students. Journal of Education for Sustainability and Diversity, [S. l.], v. 1, n. 1, p. 39–53, 2022. DOI: 10.57142/jesd.v1i1.5. Disponível em: https://educationcenter.id/journal/index.php/jesd/article/view/5. Acesso em: 6 oct. 2026.