Karl Popper 
Open Society and Its Enemies [PDF ebook] 

Popper is one of the twentieth century’s towering and influential philosophical and intellectual figures, widely read today This marks the first time The Open Society and Its Enemies has been published in a single paperback volume (hardback version was published for the Popper Centenary in 2002) Features a preface by Vaclav Havel and a 'personal recollection’ on the story behind the book’s publication by Ernst Gombrich The Open Society is one of the twentieth century’s most important books, both in its impact on European intellectual and political life and in its sales