Iskandar Iskandar, Aan Andriawan, Fani Nur Dwi Saputro, and Dwi Miftakhul Huda, “Islamic Organizations and Societal Development: An Examination of Kiai Soedja’s Perspectives on Establishing Penolong Kesengsaraan Oemoem (PKO) Muhammadijah”, BIIS, vol. 4, no. 1, pp. 75-89, May 2025.