M. A. Casar, «Mathew S. Shugart y John M. Carey, Presidents and Assemblies, Constitutional Design and Electoral Dynamics, Cambridge, Cambridge University Press, 1992, 316 p»., PyG, vol. 2, n.º 2, pp. 371–373, abr. 1995, Accedido: oct. 13, 2026. Disponible en: http://politicaygobierno.cide.edu/index.php/pyg/article/view/571