Mardhiyah, W. F. ., Manurung, P. T. ., Alamsyah, N. ., & Waluyo, M. R. . (2026). Product–service system mapping for educational service development in public primary schools. Jurnal Mantik, 9(4), 1261-1269. https://doi.org/10.35335/mantik.v9i4.6853