CASTILLO, J. KAPLAN (Morton A.): Balance of Power, Bipolarity and other Models of International Systems, en "The American Political Science Review", LI, 3, 1957 (págs. 684-695). Anuario de Filosofía del Derecho, Madrid, ES, n. 6, 2026. Disponível em: https://revistas.mjusticia.gob.es/index.php/AFD/article/view/13034. Acesso em: 5 abr. 2026.