CASTILLO, J. ANDERSON (Alan Ross) y MOORE (Omar Khayyam): The Formal Analysis of Normative Concepts, en "American Sociological Review", XXII, 1, 1957 (páginas 9-17). Anuario de Filosofía del Derecho, Madrid, ES, n. 6, 2026. Disponível em: https://revistas.mjusticia.gob.es/index.php/AFD/article/view/13046. Acesso em: 5 abr. 2026.