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Hasan M, Komara E, Rostini D, Asrofi I. Principal management in improving student discipline to support science learning effectiveness at SMPN 1 Jatinangor and SMPN 12 Bandung City. IJoTis [Internet]. 2026 Mar. 30 [cited 2026 Sep. 16];6(1):1-12. Available from: https://ejournal-dppm.upi.edu/ijotis/article/view/989