Aziez, F. et al. 2026. Readability Progression and Students’ Perceptions of Gontor Press English Lesson Textbooks in Indonesian Pesantren. Ta’dibuna: Jurnal Pendidikan Islam. 15, 5 (Nov. 2026), 776–794. DOI:https://doi.org/10.32832/tadibuna.v15i5.24548.