2026. Pengembangan Media E-Book Strumi Berbasis Qr Materi Struktur Bumi Kelas V SDN Togogan 1 Kabupaten Blitar. JURNAL PARADIGMA : Journal of Sociology Research and Education. 6, 2 (Jun. 2026), 25–45. DOI:https://doi.org/10.53682/jfrzpx25.