Effective Learning Strategies to Overcome Concentration Barriers in Tunagrahita Children at SLB Bhakti Luhur Madiun. J. Bs. Edu. R [Internet]. 2025 Sep. 7 [cited 2026 May 25];6(3):401-9. Available from: https://cahaya-ic.com/index.php/JBER/article/view/2001