CECI, Giovanni Mario. The explosion of Italian terrorism and the Piazza Fontana massacre seen by the United States. Historia Actual Online, [S. l.], n. 31, p. 29–40, 2022. DOI: 10.36132/hao.v0i31.863. Disponível em: https://historia-actual.org/Publicaciones/index.php/hao/article/view/863.. Acesso em: 23 jan. 2025.