Asrin, Ahmad, and Faisal Musa. “Internalizing Character: A Phenomenological Study of Discipline, Independence, and Simplicity Among Pesantren Students in Mandailing Natal”. Eduprof : Islamic Education Journal, vol. 7, no. 2, Sept. 2025, pp. 234-52, doi:10.47453/eduprof.v7i2.344.