1. N. Bobbio, 'Gramsci e la cultura politica italiana', Belfagor, XXXIII
2. . E. Jacobitti, Revolutionary Humanism and Historicism in Modern Italy (New Haven and London: Yale University Press, 1981), p. 6.
3. H. Mansfield, 'Machiavelli's Political Science', The American Political Science Review, 75 (1981), pp. 294–5.
4. H. Butterfield, The Statecraft of Machiavelli (London: G. Bell & Sons, 1940), especially pp. 26–41,114-32.
5. AJ. Parel, The Machiavellian Cosmos (New Haven and London: Yale University Press, 1992).