A Study of Perceived Principal Instructional Leadership and Its Relationship to Student Achievement in Private High Schools. Research Issues in Contemporary Education, [S. l.], v. 7, n. 1, p. 52–78, 2022. Disponível em: https://www.leraweb.net/ojs/index.php/RICE/article/view/92. Acesso em: 22 apr. 2026.