Mardhiyah, Wendy Febrianty, Primelshaddai Tongguran Manurung, Nanang Alamsyah, and Mohammad Rachman Waluyo. “Product–service System Mapping for Educational Service Development in Public Primary Schools”. Jurnal Mantik 9, no. 4 (February 28, 2026): 1261-1269. Accessed May 31, 2026. http://www.ejournal.iocscience.org/index.php/mantik/article/view/6853.