OGBIJI, Joseph Etiongbie. A Comparative Study of the Administrative Effectiveness of Principals of Public and Private Secondary School in Cross River State, Nigeria. International Journal of Academic Research in Progressive Education and Development, [S. l.], v. 7, n. 4, 2018. Disponível em: https://ijarped.com/index.php/journal/article/view/468. Acesso em: 4 feb. 2026.