Sari, Bernadetha Titis Wulan, and Firosalia Kristin. “Efektivitas Penggunaan Model Problem Based Learning Dan Model Group Investigation Terhadap Kemampuan Kerjasama Siswa Sekolah Dasar”. Jurnal Basicedu 4, no. 2 (March 27, 2020): 257–267. Accessed July 22, 2024. https://jbasic.org/index.php/basicedu/article/view/357.