Principal managerial skills and teachers job effectiveness in secondary schools in Calabar Educational Zone, Cross River State, Nigeria. Multi-disciplinary Journal of Research and Development Perspectives, [S. l.], v. 13, n. 1, p. 333–343, 2026. Disponível em: https://www.mjrdp-unical.org.ng/index.php/home/article/view/93. Acesso em: 15 may. 2026.