OPARAJI, I. C. .; UWAEZUOKE, M.-R. I.; OKONKWO, E. C. . The elements in system analysis on principals’ managerial effectiveness in public secondary school . Eureka: Journal of Educational Research, [S. l.], v. 3, n. 1, p. 36–43, 2024. DOI: 10.56773/ejer.v3i1.32. Disponível em: https://eureka.id-sre.org/index.php/ejer/article/view/32. Acesso em: 20 nov. 2025.