Firmansah, D. et al. 2026. The Concept of Spiritual-Based Character Education at Nusantara Beriman Islamic Boarding School Poleang Kendari, Southeast Sulawesi. At-Ta’dib. 18, 1 (Jul. 2026), 81–89. DOI:https://doi.org/10.21111/at-tadib.v18i1.83.