Martin Griffiths & Steven C. Roach 
Fifty Key Thinkers in International Relations [PDF ebook] 

Now in its second edition, Fifty Key Thinkers in International Relations has been thoroughly updated with several new entries and a new preface to reflect the latest developments. There are new sections on Constructivism, International Political Theory, and English School, as well as a range of new thinkers. They include: Samuel Huntington Christine Sylvester Jurgen Habermas John Rawls Barry Buzan Fully cross-referenced throughout, this book has everything for students of politics and international relations or indeed anyone who wants to gain an understanding of how nations can work together successfully.