Sutanto, Sutanto. “Studi Kasus Penerapan Prinsip Understanding by Design Pada Pembelajaran Matematika Kelas 5 Di SD Negeri 1 Selo Kecamatan Tawangharjo”. Jurnal Guru Sekolah Dasar 1, no. 3 (October 14, 2024): 27–34. Accessed October 12, 2025. https://jurnalgurusd.com/index.php/jgsd/article/view/44.