Isnanda, A. A., S. Mas’ula, and Y. . Yuniawatika. “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, vol. 3, no. 2, Apr. 2025, pp. 470-84, doi:10.57142/jesd.v3i2.843.