Supervisory Competencies of School Heads in Relation to Teachers’ Performance : . JPAIR Institutional Research, [S. l.], v. 12, n. 1, p. 54–68, 2019. DOI: 10.7719/irj.v12i1.744. Disponível em: https://philair.ph/index.php/irj/article/view/744.. Acesso em: 1 may. 2024.