Erna Wulandari, Marita Ika Joesidawati, and Puji Sri Handayani. “Implementasi Lesson Study Menggunakan Model Problem Based Learning Berbantuan Snowball Throwing Untuk Meningkatkan Hasil Belajar IPAS Kelas 4 Sekolah Dasar”. Jurnal Penelitian Pendidikan Indonesia (JPPI) 2, no. 3 (April 30, 2025): 348–357. Accessed July 1, 2025. https://jurnalistiqomah.org/index.php/jppi/article/view/4349.