CHIBUZO UMEN, E. Federal Character Principle and Productivity: A Survey of Federal Civil Service in Nigeria. Gusau International Journal of Management and Social Sciences, [S. l.], v. 5, n. 3, p. 19, 2022. Disponível em: https://www.gijmss.com.ng/index.php/gijmss/article/view/135. Acesso em: 7 jun. 2026.