John Gray 
Liberalisms (Routledge Revivals) [PDF ebook] 
Essays in Political Philosophy

Liberalisms, a work first published in 1989, provides a coherent and comprehensive analytical guide to liberal thinking over the past century and considers the dominance of liberal thought in Anglo-American political philosophy over the past 20 years. John Gray assesses the work of all the major liberal political philosophers including J. S. Mill, Herbert Spencer, Karl Popper, F. A Hayek, John Rawls and Robert Nozick, and explores their mutual connections and differences.