Murtiastuti, Kun. “Efektivitas Group Investigation Terhadap Kemandirian, Penalaran, Dan Self-Efficacy Matematika Peserta Didik”. Journal of Education Research 5, no. 4 (December 15, 2024): 6266–6271. Accessed July 6, 2025. https://www.jer.or.id/index.php/jer/article/view/1952.