Sari, Nina Indra, et al. “Peningkatan Hasil Belajar Matematika Kelas VI Menggunakan Model Problem Based Learning (PBL) Pada Materi Bangun Ruang”. Jurnal Ragam Pengabdian, vol. 3, no. 2, July 2026, pp. 5633-42, https://doi.org/10.62710/gtd7hf42.