Ubaidillah, U., Basri, H., & Sya'bani, M. 2021 Dec 21. Kh Imam Zarkasyi's Life Principles In Education Of Modern Pondok Santri Darussalam Gontor In Muhammad Ridlo Zarkasyi's Book. Journal Universitas Muhammadiyah Gresik Engineering, Social Science, and Health International Conference (UMGESHIC). [Online] 1:2