Fajri, Annur, and Ahmad Faizuddin. “The Concept of Integrated Islamic Schools in the 21st Century: An Understanding Among School Leaders in Pondok Modern Darussalam Gontor, Indonesia”. UMRAN - Journal of Islamic and Civilizational Studies, vol. 9, no. 1, Feb. 2022, pp. 97-106, doi:10.11113/umran2022.9n1.518.