Samsilayurni, S. et al. 2025. Principal Leadership and Supervision as Predictors of Teacher Professional Competency: An Empirical Analysis. Tadbir : Jurnal Studi Manajemen Pendidikan. 9, 1 (May 2025), 83–94. DOI:https://doi.org/10.29240/jsmp.v9i1.12833.