J. Nederman, Nature, Justice, and Duty in the Defensor Pacis, Political Theory, vol.18, issue.4, pp.615-652, 1990.
DOI : 10.1177/0090591790018004010

C. Mabboux and «. Cicero, Communal Civic Model : Italian Communes of the Thirteenth and Fourteenth Centuries », Bulletin of the Institute of Classical Studies, pp.30-45, 2017.

. Tullius, according to the sources, his ancestors were kings of their city He became a great citizen in Rome on his own merits, as he was not only promoted to the patrician group, but also appointed to the senatorial order, and even reached the highest rank of the consulate; in that [?] having cleverly foreseen the conspiracy organized by Catiline, he freed the city from a major hazard, having captured some young Roman noblemen, who were involved in it, when Catiline had already left Rome

C. Casale and . Firenze, Il repubblicanesimo di Coluccio Salutati); D. Girgensohn, 'Francesco Zabarella aus Padua: Gelehrsamkeit und politisches Wirken eines Rechtsprofessors während des grossen abendländischen Schismas, Zeitschrift der Savigny-Stiftung für Rechtsgeschichte, pp.79-232, 1993.

M. Mcmanamon, Pierpaolo Vergerio the Elder. The Humanist as orator, pp.54-59, 1996.

. Skinner, Visions of Politics, 2 vols (Cambridge 2002) II 10?38; H. Baron, The crisis of the early Italian Renaissance. Civic humanism and republican liberty in an age of classicism and tyranny, 1955.