 His "Prison Notebooks" are considered a highly original contribution to 20th century political theory.Gramsci drew insights from varying sources – not only other Marxists but also thinkers such as Niccolò Machiavelli, Vilfredo Pareto, Georges Sorel and Benedetto Croce.The notebooks cover a wide range of topics, including Italian history and nationalism, the French Revolution, fascism, Fordism, civil society, folklore, religion and high and popular culture.