Mulia, Fitri. “Peningkatan Hasil Belajar Penjumlahan Dan Pengurangan Kelas 2 SD Negeri Sawah Besar 01 Melalui Problem Based Learning Berbantuan Media Kongkret”. Prosiding Seminar Nasional Pendidikan Profesi Guru 1, no. 2 (November 30, 2023): 2525–2533. Accessed December 6, 2025. https://conference.upgris.ac.id/index.php/psnppg/article/view/5409.