Alamsyah, Adam, et al. “Development of Academic Self-Concept Instrument for Islamic Religious Education in Senior High Schools: : A Psychometric Study Within Indonesia’s Independent Curriculum Context”. Belajea: Jurnal Pendidikan Islam, vol. 10, no. 2, Oct. 2025, pp. 457-84, doi:10.29240/belajea.v10i2.13423.