GRILLOTTI, M. G. The Rome underground railway: present situation and projects for the future. Bollettino della Società Geografica Italiana, [S. l.], p. 45–52, 1986. DOI: 10.36253/bsgi-6432. Disponível em: https://bsgi.it/index.php/bsgi/article/view/6432. Acesso em: 16 oct. 2026.