ISNANDA, A. A.; MAS’ULA, S.; YUNIAWATIKA , Y. . Development of Problem-based Learning-Based E-Module Assisted by QR Code Measurement Materials for Grade IV Elementary School Students. Journal of Education for Sustainability and Diversity, [S. l.], v. 3, n. 2, p. 470–484, 2025. DOI: 10.57142/jesd.v3i2.843. Disponível em: https://educationcenter.id/journal/index.php/jesd/article/view/843. Acesso em: 6 oct. 2026.