The Impact of Large Class Sizes on Student Concentration in the Second Semester of Islamic Education at UIN Professor Kiai Haji Saifuddin Zuhri Purwokerto. Scientia Causa [Internet]. 2026 May 3 [cited 2026 Jun. 9];1(2):01-8. Available from: https://researchfrontiers.id/scientiacausa/article/view/97