Murtiastuti K. Efektivitas Group Investigation terhadap Kemandirian, Penalaran, dan Self-efficacy Matematika Peserta Didik. J. Educ. Res. [Internet]. 2024 Dec. 15 [cited 2025 Jul. 6];5(4):6266-71. Available from: https://www.jer.or.id/index.php/jer/article/view/1952