MANAGEMENT COMPETENCE; NEED FOR EFFECTIVE PROFESSIONALIZATION OF NIGERIA SECONDARY SCHOOL PRINCIPALS. Arabian Journal of Business and Management Review (AJBMR), [S. l.], v. 2, n. 10, p. 49–54, 2013. DOI: 10.65453/ajbmr.v2i10.418. Disponível em: https://j.arabianjbmr.com/index.php/ajbmr/article/view/418. Acesso em: 13 jun. 2026.