Dudley Knowles 
Political Philosophy [PDF ebook] 

In outlining the central problems of political philosophy, Knowles introduces the ideas of key thinkers, including Hobbes, Locke, Marx, and Mill, and influential contemporary theorists such as Berlin, Rawls, and Nozick. He discusses how to do political philosophy through a detailed examination of utilitarianism, exemplifying a commitment to the liberal practice of rational enquiry. Written in an easily readable style, Political Philosophy will be of interest general readers as well as to students and teachers of philosophy and political theory.