Excelente pergunta!
Não sou especialista, mas alguns deles vc mesmo escreveu :-).
On Liberty - John Stuart Mill
Utilitarianism - John Stuart Mill
Liberalism: The Classical Tradition - Ludwig von Mises
The Wealth of Nations - Adam Smith
The Road to Serfdom - Friedrich A. Hayek
Capitalism and Freedom - Milton Friedman
Free to Choose: A Personal Statement Paperback - Milton Friedman
Human Action: A Treatise on Economics - Ludwig von Mises
The Open Society and Its Enemies - Volume One: The Spell of Plato
The Open Society and Its Enemies - Volume Two: Hegel and Marx