Arwadi, Fajar, and B. Bustang. “Supporting Elementary School children’s Skill and Concept Understanding in Solving Combinatorics Problems”. Jurnal Pendidikan dan Pengajaran 51, no. 1 (May 6, 2018): 23–31. Accessed May 4, 2024. https://ejournal.undiksha.ac.id/index.php/JPP/article/view/13985.