ONU, G.; CFFLAMOGU, A. P.; ONWUGHALU, V. C. Regime Types and Power Equations in Political Systems: A Study of Presidentialization of Power in Democracies. Nnamdi Azikiwe Journal of Political Science, [S. l.], v. 3, n. 1, p. 27–40, 2012. Disponível em: https://najops.org.ng/index.php/najops/article/view/105. Acesso em: 19 apr. 2025.